Consulta: subjectFacets:"Pleistocene"
Registros recuperados: 51
Data/hora: 01/06/2024 04:39:52

Progressive shoaling of the equatorial Pacific thermocline over the last eight glacial periods
Provedor de dados: 5
Autores: Regoli, Fabienne; De Garidel-thoron, Thibault; Tachikawa, Kazuyo; Jian, Zhiming; Ye, Liming; Droxler, Andre W.; Lenoir, Guillaume; Crucifix, Michel; Barbarin, Nicolas; Beaufort, Luc.
The depth of equatorial Pacific thermocline is diagnostic of the main modes of tropical climates. Past estimates of Pacific thermocline dynamics have been reconstructed either for the Last Glacial Maximum or on longer timescales at low resolution. Here we document a new high-resolution set of reconstructed past sea surface and subsurface waters temperatures from the southwestern subequatorial Pacific, core MD05-2930, in the Gulf of Papua, over the last 800 ka. We used two morphotypes of Globigerinoides ruber known to live at different water depths to reconstruct past stratification. We estimated calcification temperature of each morphotypes by Mg/Ca paleothermometry. Our subequatorial Pacific thermocline paleotemperature record indicates a response of the...
Tipo: Text
Palavras-chave: Equatorial Pacific; Thermocline; Pleistocene.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00295/40572/39477.pdf

Évolution pléistocène de la Seine fluviatile préservée en Baie de Seine
Provedor de dados: 5
Autores: Benabdellouahed, Massinissa; Dugue, Olivier; Tessier, Bernadette; Thinon, Isabelle; Guennoc, Pol.
New high-resolution seismic data complemented with bedrock samples allowed us to propose a revised geological map of the Bay of Seine and to better define the control by the geological substrate on the morphogenesis and evolution of the Seine River during Pleistocene times. The new data confirm previous works. The Bay of Seine can be divided into two geological parts: a Mesozoic monocline domain occupying most of the bay and a syncline domain, mostly Tertiary, in the north, at the transition with the Central English Channel area. The highlighting of Eocene synsedimentary deformations, marked by sliding blocks in the syncline domain, is one of the most original inputs of this new study in the Bay of Seine that underlines the significant role of the...
Tipo: Text
Palavras-chave: Pléistocène; Normandie; Baie de Seine; Paléo-Seine; Sismique haute résolution; Incision; Nappes étagées; Nappes emboîtées; Contrôle tectonique; Normandy; Bay of Seine; Pleistocene; Paleo-Seine river; High-resolution seismic; Incision; Strath terraces; Fill terraces; Tectonic control.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00167/27800/26000.pdf

Unraveling glacial hydroclimate in the Indo‐Pacific Warm Pool: perspectives from water isotopes
Provedor de dados: 5
Autores: Windler, Grace; Tierney, Jessica E.; Zhu, Jiang; Poulsen, Christopher J.
The Indo‐Pacific Warm Pool (IPWP) is home to the warmest sea surface temperatures in the world oceans, favoring strong tropospheric convection and heavy rainfall. The mechanisms controlling long‐term change in the region’s hydroclimate are still uncertain. Here, we present a 450,000‐year record of precipitation δD from southern Sumatra that records a consistent pattern of glacial isotopic enrichment and interglacial depletion. We synthesize existing paleo‐indicators of precipitation δD and δ18O in the IPWP and compare results with water isotope‐enabled climate simulations of the Last Glacial Maximum (LGM). The simulations show glacial isotopic enrichment over the eastern Indian Ocean extending into the southern IPWP and isotopic depletion over southeast...
Tipo: Text
Palavras-chave: Leaf wax; Water isotopes; Indo‐Pacific Warm Pool; Pleistocene; Proxy‐model comparison.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00659/77060/78359.pdf

A multi-proxy stalagmite record from northwestern Namibia of regional drying with increasing global-scale warmth over the last 47 kyr: The interplay of a globally shifting ITCZ with regional currents, winds, and rainfall
Provedor de dados: 5
Autores: Railsback, L. Bruce; Brook, George A.; Liang, Fuyuan; Marais, Eugene; Cheng, Hai; Edwards, R. Lawrence.
Stalagmite Orum-1 from a cave near Orumana in northwestern Namibia provides a multi-proxy record of regional drying with increasing global-scale warmth over the last 47 kyr, in a region with few long well-dated location specific paleoclimate records. Data from Stalagmite Orum-1 include carbon and oxygen stable isotope ratios, proportions of aragonite and calcite, pronouncedly differing petrographic fabrics, positions of layer-bounding surfaces, variation in layer-specific width, and changes in layer thickness, all of which combine to support change from wetter to drier conditions. Combined with fourteen U-Th ages, they suggest that climate was wetter in northwestern Namibia during globally cold MIS 3 than it is today, and with more grass than is present...
Tipo: Text
Palavras-chave: Namibia; Paleoclimate; Pleistocene; Holocene; Savanna; Stalagmite.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53213/54862.pdf

Vegetation dynamics in southern France during the last 30 ky BP in the light of marine palynology
Provedor de dados: 5
Autores: Beaudouin, Célia; Jouet, Gwenael; Suc, Jean-pierre; Berne, Serge; Escarguela, Gilles.
The composition of the glacial vegetation of southern French plains has been a matter of debate for several decades. Vegetation is considered as steppic according to French and Spanish lacustrine pollen records whereas cave deposits suggest the presence of mesothermophilous trees through the Last Glacial Maximum. In our paper, we display new palynological records from marine sediments of the Gulf of Lions. They indicate the presence of Abies, Picea and deciduous Quercus in the Gulf of Lions, certainly located in the drainage basins of the Pyreneo-Languedocian rivers. These populations that were sensitive to short climatic events during Marine Isotopic Stage 2 could have been linked to northeastern Spanish and southeastern French relicts already evidenced...
Tipo: Text
Palavras-chave: Mediterranean Sea; Pleistocene; Climate; Vegetation.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2804.pdf

The last occurrence of Proboscia curvirostris in the North Atlantic marine isotope stages 9-8
Provedor de dados: 5
Autores: Koc, N; Labeyrie, L; Manthe, S; Flower, Bp; Hodell, Da; Aksu, A.
Well-preserved diatoms are present in high sedimentation rate Pleistocene cores retrieved on ocean Drilling Program (ODP) Legs 151, 152, 162 and IMAGES cruises of RN Marion Dufresne from the North Atlantic. Investigation of the stratigraphic occurrence of diatom species shows that the youngest diatom event observed in the area is the last occurrence (LO) of Proboscia curvirostris (Jouse) Jordan and Priddle. P. curvirostris is a robust species that can easily be identified in the sediments, and therefore can be a practical biostratigraphic tool. We have mapped its: areal distribution, and found that it stretches from 40 degreesN to 80 degreesN in the North Atlantic. Further, we have correlated the LO P. curvirostris to the oxygen isotope records of six...
Tipo: Text
Palavras-chave: Biostratigraphy; North Atlantic; Diatoms; Pleistocene; Paleoceanography; Isotope stratigraphy; Oxygen.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00221/33210/31708.pdf

East Asian monsoon history and paleoceanography of the Japan Sea over the last 460,000 years
Provedor de dados: 5
Autores: Gallagher, Stephen J; Sagawa, Takuya; Henderson, Andrew C. G.; Saavedra-pellitero, Mariem; De Vleeschouwe, David; Black, Heather; Itaki, Takuya; Toucanne, Samuel; Bassetti, Maria-angela; Clemens, Steve; Anderson, William; Alvarez-zarikian, Carlos; Tada, Ryuji.
The Japan Sea is directly influenced by the Asian monsoon, a system that transports moisture and heat across southeast Asia during the boreal summer, and is a major driver of the Earth's ocean‐atmospheric circulation. Foraminiferal and facies analyses of a 460 kyr record from IODP Expedition 346 Site U1427 in the Japan Sea reveal a record of nutrient flux and oxygenation that varied due to sea level and East Asian monsoon intensity. The East Asian summer monsoon (EASM) was most intense during MIS (Marine Isotope Stage) 5e, 7e, 9e and 11c when the Tsushima Warm Current flowed into an unrestricted well mixed normal salinity Japan Sea. Whereas East Asian winter monsoon (EAWM) conditions dominated MIS 2, 4, 6 and 8 when sea level minima restricted the Japan...
Tipo: Text
Palavras-chave: Tsushima Warm Current; Pleistocene; Holocene; Paleoceanography; East Asian summer monsoon; East Asian winter monsoon.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00444/55591/57215.pdf

Impact of iceberg melting on Mediterranean thermohaline circulation during Heinrich events
Provedor de dados: 5
Autores: Sierro, Fj; Hodell, Da; Curtis, Jh; Flores, Ja; Reguera, I; Colmenero-hidalgo, E; Barcena, Ma; Grimalt, Jo; Cacho, I; Frigola, J; Canals, M.
Down-core samples of planktonic and benthic foraminifera were analyzed for oxygen and carbon isotopes in International Marine Past Global Changes Study (IMAGES) core MD99-2343 in order to study the interactions between climate change in the Northern Hemisphere and the western Mediterranean thermohaline circulation at times of Heinrich events (HE). Our results confirm the antiphase correlation between enhanced North Atlantic Deep Water formation and low ventilation in the Mediterranean. However, this study reveals that this antiphase relationship in deepwater formation between the North Atlantic and Mediterranean was interrupted during times of HE when the injection of large volumes of water from melting icebergs reached the entrance to the Mediterranean....
Tipo: Text
Palavras-chave: Climatic change; Heinrich events; Mediterranean Sea; Carbon and oxygen isotopes; Thermohaline circulation; Pleistocene.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00232/34354/32759.pdf

Evolution of Janthina and Recluzia (Mollusca: Gastropoda: Epitoniidae)
Provedor de dados: 5
Autores: Beu, A. G.
Fossil and living neustonic gastropods referred previously to Janthinidae are revised and included in Epitoniidae. Species recognized in Janthina Röding, 1798 (= Iodes, Iodina and Amethistina Mörch, 1860, Hartungia Bronn, 1861, Heligmope Tate, 1893, Violetta Iredale, 1929, Parajanthina Tomida &amp; Itoigawa, 1982, and Kaneconcha Kaim, Tucholke &amp; Warén, 2012) are J. typica (Bronn), Messinian–early Piacenzian (latest Miocene–early late Pliocene), c. 7–3.0 Ma (New Zealand, southern Australia, Japan, Morocco, dredged off Brazil, Madeira, Gran Canaria I., Selvagem Grande I., and Santa Maria I., Azores); J. krejcii sp. nov., Zanclean (early Pliocene), c. 4.8–4.3 Ma (Santa Maria I.); J. chavani (Ludbrook), late Piacenzian–early Calabrian (latest...
Tipo: Text
Palavras-chave: Biostratigraphy; Cosmopolitan; Fossil record; Neustonic gastropods; Pleistocene; Pliocene; Phylogeny.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00403/51476/52047.pdf

Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco)
Provedor de dados: 5
Autores: Lafosse, M.; Gorini, C.; Le Roy, P.; Alonso, B.; D'Acremont, E.; Ercilla, G.; Rabineau, Marina; Vazquez, J. T.; Rabaute, A.; Ammar, A.
In active basins, tectonics can segment the continental shelf and control its stratigraphic architecture and physiography. Segmentation can explain the local evolution and morphology of the continental shelf because of sea-level variations, local tectonic segmentation and hydrodynamic processes. Here we investigate the tectonically active Morocco continental margin (southern Alboran Sea) using high-resolution seismic profiles and multibeam bathymetric data. The active faults bounding the transtensive Nekor basin triggered the segmentation of the shelf into three sectors showing different subsidence rates: a western sector corresponding to an extensive fault relay, a central sector corresponding to the subsiding Al-Hoceima Bay and an eastern sector...
Tipo: Text
Palavras-chave: Seismic stratigraphy; Active tectonic; Pleistocene; Continental shelf; Swath bathymetry; Geomorphology; Western Mediterranean.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00451/56232/57812.pdf

Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum
Provedor de dados: 5
Autores: Schneider, A.; Panieri, G.; Lepland, A.; Consolaro, C.; Cremiere, A.; Forwick, M.; Johnson, J. E.; Plaza-faverola, A.; Sauer, S.; Knies, J.
Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth, is one of the northernmost known active methane seep sites and is characterised by a subseafloor fluid flow system, numerous seafloor pockmarks and gas flares in the water column. In this study, we develop a Late Pleistocene and Holocene stratigraphic framework, use stable oxygen and carbon isotope signatures (δ18O, δ13C) of benthic and planktic foraminifera, the mineralogical and carbon isotope composition of methane-derived authigenic carbonate (MDAC) and...
Tipo: Text
Palavras-chave: Micropaleontology; Foraminifers; Stable isotopes; Methane seepage; Authigenic carbonate; Holocene; Pleistocene; Paleogeography; Deglaciation; Arctic Ocean.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55652/60554.pdf

Late Pleistocene to Recent ostracod assemblages from the western Black Sea
Provedor de dados: 5
Autores: Boomer, Ian; Guichard, Francois; Lericolais, Gilles.
During the last glacial phase the Black Sea basin was isolated from the world's oceans due to the lowering of global sea-levels. As sea-levels rose during the latest glacial and early Holocene period, the Black Sea was once again connected to the eastern Mediterranean via the Dardanelles-Marmara-Bosporus seaway. In recent years, trace element and stable isotope analyses of ostracod assemblages have yielded important details regarding the hydrological evolution of the Black Sea during these events. Despite this focus on the geochemical signatures of the ostracods, little if any attention has been paid to the taxonomic composition of the ostracod assemblages themselves and there are notably few publications on the sub-littoral fauna of this important water...
Tipo: Text
Palavras-chave: Ponto-Caspian; Black Sea; Ostracoda; Pleistocene; Holocene.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00025/13646/10887.pdf

Reconstruction des transferts sédimentaires en provenance du système glaciaire de Mer d'Irlande et du paléofleuve Manche au cours des derniers cycles climatiques
Provedor de dados: 5
Autores: Toucanne, Samuel.
The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental shelf of the southern part of the British Isles induced the appearance of the 'Fleuve Manche' palaeoriver, one of the largest systems that drained the European continent. Sedimentary records from the Bay of Biscay offer an independent record allowing the reconstruction of the freshwater and sediment discharges of the 'Fleuve Manche', and the possibility of detecting the imprint of surrounding ice-sheet oscillations and attendant modification of hinterland drainage...
Tipo: Text
Palavras-chave: Land sea correlations; European fluvial system; Glacial Irish Sea system; 'Fleuve Manche' palaeoriver; Ice sheets; Glaciations; Climate; Pleistocene; Turbidite systems; Sediment transfer; Bay of Biscay; Corrélations terre mer; Réseau de drainage européen; Système glaciaire de Mer d'Irlande; Fleuve Manche; Calottes glaciaires; Glaciations; Climat; Pléistocène; Systèmes turbiditiques; Transferts sédimentaires; Golfe de Gascogne.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6328.pdf

Climatic variability in Mfabeni peatlands (South Africa) since the late Pleistocene
Provedor de dados: 5
Autores: Baker, Andrea; Pedentchouk, Nikolai; Routh, Joyanto; Roychoudhury, Alakendra N.
It has been postulated that a bipolar seesaw interhemispheric mechanism dominated the relationship between the Northern and Southern hemisphere climates since the late Pleistocene. A key test for this proposition would be to undertake palaeoenvironmental studies on terrestrial archives in climatically sensitive regions. Southern Africa's contemporary C-3 and C-4 terrestrial plant distributions display a definitive geographical pattern dictated by different growing season rainfall and temperature zones; however, the region is generally archive poor due to its overall semi-arid climate and high relief topography. The Mfabeni peatland, with a basal age of c. 47 k yrs calibrated before present (kcal yr BP), is one of the oldest continuous coastal peat deposits...
Tipo: Text
Palavras-chave: Holocene; Pleistocene; Paleoclimatology; Southern Africa; Stable isotopes; Continental biomarkers; Peatland.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00420/53176/83104.pdf

Dimensions and architecture of late Pleistocene submarine lobes off the northern margin of East Corsica
Provedor de dados: 5
Autores: Deptuck, M; Piper, D; Savoye, Bruno; Gervais, A.
Sandy lobe deposits on submarine fans are sensitive recorders of the types of sediment gravity flows supplied to a basin and are economically important as hydrocarbon reservoirs. This study investigates the causes of variability in 20 lobes in small late Pleistocene submarine fans off East Corsica. These lobes were imaged using ultra-high resolution boomer seismic profiles (&lt; 1 m vertical resolution) and sediment type was ground truthed using piston cores published in previous studies. Repeated crossings of the same depositional bodies were used to measure spatial changes in their dimensions and architecture. Most lobes increase abruptly down-slope to a peak thickness of 8 to 42 m, beyond which they show a progressive, typically more gradual, decrease...
Tipo: Text
Palavras-chave: Turbidites; Submarine lobes; Pleistocene; Dimensions; Compensation stacking; Architecture.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4712.pdf

Genetic structure and demographic history of striped weakfish Cynoscion guatucupa (sciaenidae) from the southwestern atlantic
Provedor de dados: 46
Autores: Alonso,M.P; Fernández Iriarte,P.J.
In South America, the Pleistocene was characterized by important environmental changes related to glacial cycles, which had significant effects on the evolutionary history of several marine species. To evaluate the pattern of demographic history and the genetic structure of striped weakfish Cynoscion guatucupa, a 401 bp fragment of the mitochondrial Cytochrome b gene was sequenced from 92 individuals from three coastal areas in Argentina and one in Brazil in the southwestern Atlantic. Haplotype diversity was high, whereas nucleotide diversity was low among all sampling sites. The star-like pattern was not phylogeographically structured, in agreement with the AMOVA analysis. The Fu&amp;#8217;s test was negative and highly significant whereas the mismatch...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic structure; Cytochrome b; Marine fish; Pleistocene; Mutation rate.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332015000300001

The extinction of some south american camelids: the case of Lama (Vicugna) Gracilis
Provedor de dados: 81
Autores: Cajal,Jorge; Tonni,Eduardo P.; Tartarini,Viviana.
Lama (Vicugna) gracilis (Gervais and Ameghino, 1881) is a Camelidae that inhabited the low plains of Argentina and Uruguay during the Pleistocene and early Holocene. Considering that Lama gracilis was a vicariant of L. vicugna in the low plains, sympatry cases between Lama guanicoe and Lama vicugna are analyzed to test the hypothesis that considers the competence for the same resource as the cause of extinction of Lama gracilis. It is concluded that the reduced populations of L. gracilis were forced to extinction especially by hunting pressure of paleoindian groups.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Camelidae; Extinction; Pleistocene; South America.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832010000100014

The fossil Porcupine Hystrix lagrelli Lonnberg, 1924 from the Pleistocene of China and Java and its phylogenetic relationships
Provedor de dados: 16
Autores: Weers, D.J. van.
The Pleistocene Hystrix vanbreei from Sangiran, Java, and Hystrix lagrelli from the Pleistocene of Henan, China are synonymized. The phylogenetic relationship of H. lagrelli with the subgenera Thecurus, Acanthion and Hystrix s.s. is discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Hystrix; Acanthion; China; Java; Pleistocene.
Ano: 1995
URL: http://www.repository.naturalis.nl/record/505254

The Tegelen clay-pits: a hundred year old classical locality
Provedor de dados: 16
Autores: Hoek Ostende, L.W. van den.
Having been described in 1904 by Dubois as a locality for fossil mammals, the Tegelen clay-pits are nowadays considered a ‘classical’ locality. It is the type locality of the Tiglian, a warm period of the Early Pleistocene or Late Pliocene. The pits are primarily known for their mammalian remains, but have also yielded seeds, pollen and freshwater snails. A century of collecting has resulted in extensive collections of large mammals in various museums, the most important of which are the Teylers Museum, Haarlem and the National Museum of Natural History Naturalis in Leiden. The latter museum also holds a large collection of microvertebrates, collected during campaigns in the 1970s. These campaigns showed that, in spite of the numerous fossils, the Tegelen...
Tipo: Article / Letter to the editor
Palavras-chave: Tegelen; Tiglian; Pleistocene; Fossil mammals; 38.20.
Ano: 2004
URL: http://www.repository.naturalis.nl/record/215458

Fossil brachiopods from the Pleistocene of the Antilles
Provedor de dados: 16
Autores: Harper, D.A.T.; Donovan, S.K.
Pleistocene brachiopods are poorly known from the Antillean region, but are locally common in forereef deposits of Jamaica (lower Pleistocene Manchioneal Formation) and Barbados (Coral Rock). Of the four species known, two are new. Lacazella sp. cf. L. caribbeanensis Cooper, an encrusting thecideidean, is known from only three valves. Other species are terebratulides. Tichosina inconstanta sp. nov. is a large, ventribiconvex Tichosina species of elongate oval to tear-drop shaped outline, variably uniplicate with a pedicle foramen of moderate diameter. It differs from the similar Tichosina? bartletti (Dall) in having a larger pedicle foramen and a less-marked plication. Argyrotheca barrettiana (Davidson) is a medium to large, usually transverse Argyrotheca...
Tipo: Article / Letter to the editor
Palavras-chave: Brachiopoda; Pleistocene; Systematics; Jamaica; Barbados; Antilles; 42.72; 38.22.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/314198

Biometric analysis and taxonomic allocation of Pleistocene Hystrix specimens (Rodentia, Porcupines) from China
Provedor de dados: 16
Autores: Weers, D.J. van; Shaohua, Zheng.
Early to Middle Pleistocene Hystrix material in the collections of the IVPP in Beijing, has been biometrically studied and compared with other fossil and extant species. The specimens are from Zhoukoudian (Beijing), the Liucheng Gigantopithecus cave (Guangxi) and other caves in that province, the Wazhuwan and Yanhui Cave (Guizhou) and from Longgupo (Sichuan). None of the fossil specimens can be allocated to the extant Chinese Hystrix brachyura subcristata Swinhoe, 1870, subgenus Acanthion F. Cuvier, 1823. Most of the collections studied consist of a mixture of two species with overlapping size ranges. Cheek teeth of most Hystrix species do not show diagnostic characters other than size, so not every one of them can be assigned with certainty to the larger...
Tipo: Article / Letter to the editor
Palavras-chave: Hystrix; China; Pleistocene; Nihewanian; Zhoukoudianian; H. magna; H. kiangsenensis.
Ano: 1998
URL: http://www.repository.naturalis.nl/record/505208

Petauristidae and Sciuridae (Mammalia, Rodentia) from Tegelen, Zuurland, and the Maasvlakte (the Netherlands)
Provedor de dados: 16
Autores: Reumer, J.W.F.; Hoek Ostende, L.W. van den.
The number of known sciurid and petauristid fossils from The Netherlands is nearly doubled with the description of material from the Zuurland boreholes, the Maasvlakte, and the Tegelen claypit. The material from Tegelen is assigned to a new species of flying squirrel, Hylopetes debruijni nov. sp. One molar from the late Early Pleistocene of the Zuurland borehole is assigned to Sciurus cf. S. vulgaris. The remaining finds from the Tiglian of the Zuurland boreholes, as well as the single molar from the Maasvlakte, are all assigned to Spermophilus primigenius; this name is preferred over the suggestive use of names of recent ground squirrels for fossil material. The presence, during roughly the same stratigraphic interval, of a flying squirrel in Tegelen and...
Tipo: Article / Letter to the editor
Palavras-chave: New taxon; Tiglian; Pleistocene; Hylopetes; Sciurus; Spermophilus; The Netherlands; 38.22; 42.84.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/328009

Functional morphology and fur patterns in Recent and fossil Panthera species
Provedor de dados: 16
Autores: Nagel, D.; Hilsberg, S.; Benesch, A.; Scholz, J.
According to caves drawings, male specimens of ice age cave lions lacked a mane. Ethological observations of the recent subspecies showed the significance of the mane of male lions (Panthera leo) in intraspecific social interaction. For the Pleistocene lion, there are two possible implications; the social system was different from the modern subspecies or the cooler climate did not allow the development of manes. Whereas the former can only be discussed, the latter is supported by evidence based on infrared thermography and considerations on thermoregulation. Thermal images of the recent subspecies clearly demonstrate the significance of mane development in terms of functional morphology. Probably, manes in felids can develop in warm climate only. The mane...
Tipo: Article / Letter to the editor
Palavras-chave: Cave lion; Fur pattern; Functional morphology; Pleistocene; 42.84; 38.22.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/219302

A taxonomic revision of the Pleistocene Hystrix (Hystricidae, Rodentia) from Eurasia with notes on the evolution of the family
Provedor de dados: 16
Autores: Weers, D.J. van.
Measurements of many hundreds of the high-crowned cheek teeth of Hystrix specimens from the Euro-Asiatic Pleistocene in the collections of European and Asiatic institutions have been compared with extant species for a revision of the genus. A review is given about the extant genera and species of the family. The number of recognisable Euro-Asiatic species in the fossil record is reduced from eight to five. The European H. (A.) vinogradovi Argyropulo, 1941 is here considered to be a synonym of H. (A.) brachyura Linnaeus, 1758, and the three Asiatic species H. (H.) crassidens Lydekker, 1886, H. (H.) gigantea Van Weers, 1985 and H. (H.) magna Pei, 1987 are synonymized with H. (H.) refossa Gervais, 1852. Most of the Chinese fossil specimens are properly...
Tipo: Article / Letter to the editor
Palavras-chave: Porcupines; Asia; Evolution; Europe; Paleogeography; Pleistocene; 42.84.
Ano: 2005
URL: http://www.repository.naturalis.nl/record/209654

The porcupine Hystrix (Acanthion) brachyura punungensis subsp.
Provedor de dados: 16
Autores: Weers, D.J. van.
A large number of isolated cheek teeth and a mandibular fragment of porcupines from the Late Pleistocene fissure deposits near Punung, Java, are compared with extant H. (Acanthion) brachyura Linnaeus, 1758 (southeast Asia) and H. (Acanthion) javanica (F. Cuvier, 1823) (Java). Middle Pleistocene and Holocene specimens from Java are compared with the latter species. The Punung specimens belong to one species and are considered a new subspecies, Hystrix brachyura punungensis subsp. nov. The Middle Pleistocene specimens are allocated to Hystrix brachyura subsp. and those from the Holocene to Hystrix javanica.
Tipo: Article / Letter to the editor
Palavras-chave: Rodentia; Porcupines; Pleistocene; Punung; Java; 42.84; 38.22.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/219301

Dental morphology of Talpa europaea and Talpa occidentalis (Mammalia: Insectivora) with a discussion of fossil Talpa in the Pleistocene of Europe
Provedor de dados: 16
Autores: Cleef-Roders, J.T. van; Hoek Ostende, L.W. van den.
A description is given of the last premolar and molars of T. europaea from The Netherlands and T. occidentalis of Spain. The metrical and morphological differences between the dentitions of the two species are small. A review is given of the literature of fossil Talpa in the Pleistocene of Europe. The suggestion that T. minor is ancestral to T. caeca is rejected. T. fossilis is tentatively considered a junior synonym of T. europaea.
Tipo: Article / Letter to the editor
Palavras-chave: Talpa; Dentitions; Pleistocene; Europe; 42.84.
Ano: 2001
URL: http://www.repository.naturalis.nl/record/217433

The type material and the enamel structure of Villanyia exilis KRETZOI, 1956 (Arvicolidae, Rodentia)
Provedor de dados: 16
Autores: Mayhew, D.F.
Re-examination of the two teeth constituting the original type and genotype material of Villanyia exilis KRETZOI, 1956 from Villány-5, Hungary, indicates that subsequently published descriptions need revision. The tooth selected as the lectotype of Villanyia exilis by RABEDER (1981) is considered here to belong to Clethrionomys kretzoii (KOWALSKI, 1958). The second specimen, with morphology in accordance with the original description of Kretzoi, is considered to represent the characters of Villanyia exilis. In order to stabilise the nomenclature in accordance with current usage an application has been made to the International Commission on Zoological Nomenclature. The fine structure of the enamel of Villanyia exilis as defined above is described for the...
Tipo: Article / Letter to the editor
Palavras-chave: Voles; Pliocene; Pleistocene; Taxonomy; Evolution; Europe; Enamel structure.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/659250

Fossil Crustacea of the Late Pleistocene Port Morant Formation, west Port Morant Harbour, southeastern Jamaica
Provedor de dados: 16
Autores: Collins, J.S.H.; Donovan, S.K.; Stemann, T.A.
The Late Pleistocene Port Morant Formation of southeast Jamaica is particularly rich in fossil marine crustaceans. A new locality on the west side of Port Morant Harbour, parish of St. Thomas, has yielded decapods including the callianassids Lepidophthalmus jamaicense? (Schmitt ), Neocallichirus peraensis Collins et al. and Neocallichirus? sp.; anomurans Petrochirus bahamensis (Herbst) and Paguristes sp. cf. P. lymanni A. Milne-Edwards &amp; Bouvier; and brachyurans Hepatus praecox Collins et al., Persephona sp., Mithrax acuticornis Stimpson, Mithrax verrucosus H. Milne Edwards, Mithraculus forceps A. Milne-Edwards, aff. Hyas sp., Portunus vocans (A. Milne-Edwards), Achelous sebae (H. Milne Edwards), Actaea sp. cf. A. bifrons Rathbun, Actaea acantha (H....
Tipo: Article / Letter to the editor
Palavras-chave: Jamaica; Pleistocene; Crustacea; Decapoda; Cirripedia; 42.74.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/301551

Elephas Celebensis (Hooijer) from the Pleistocene of Java
Provedor de dados: 16
Autores: Hooijer, D.A.
In a recent monograph, Maglio (1973) states that Stegodon hypsilophus Hooijer (1954a) must be considered a synonym of Elephas celebensis (Hooijer, 1949). Though Elephas celebensis is smaller-toothed and more hypsodont than the "hypsilophous stegodont" of Java (width of M3 42-52 mm against 62-64 mm; height-width index 106-116 against 87-89: Hooijer, 1954a, b; Maglio, 1973: 46, table 21), Maglio (1973: 47) considers the differences not great when the degree of variation of known samples (in other species) is allowed for.  Over the years, I studied molars of pygmy proboscideans from various Indonesian islands, and it never occurred to me that the Java pygmy would be same as that from Celebes until this suggestion was put forth by Dr. Maglio. I had described...
Tipo: Article / Letter to the editor
Palavras-chave: Elephas celebensis (Hooijer); Pleistocene; Java; 38.22; 42.84.
Ano: 1974
URL: http://www.repository.naturalis.nl/record/319209

A new species of land crab, Sesarma Say, 1817 (Decapoda, Brachyura), from the Pleistocene of Jamaica
Provedor de dados: 16
Autores: Collins, J.S.H.; Mitchell, S.F.; Donovan, S.K.
Terrestrial arthropods are poorly known from the Cenozoic of Jamaica. A probably Late Pleistocene land crab, Sesarma primigenium sp. nov., is described from the Western Cement Company Cave, parish of St. Elizabeth, southwestern Jamaica. The same species is also tentatively recognised from the Late Pleistocene Red Hills Road Cave, parish of St. Andrew, eastern central Jamaica. The propodi of the new species are moderately globose, with an upper margin that is comparatively short and finely granulate ridged; the fingers are obscurely spooned and gaped; and the in-turned fixed finger is in line with, and a litt le shorter than, the basal margin. Of the nine extant endemic members of this subgenus in Jamaica, S. jarvisi Rathbun and S. verleyi Rathbun have...
Tipo: Article / Letter to the editor
Palavras-chave: Land crabs; Sesarma; Caves; Pleistocene; Jamaica; 42.74.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/301550

Early Pleistocene lineages of Bagre bagre (Linnaeus, 1766) (Siluriformes: Ariidae), from the Atlantic coast of South America, with insights into the demography and biogeography of the species
Provedor de dados: 83
Autores: Silva,Wemerson C. da; Marceniuk,Alexandre P.; Sales,João Braullio L.; Araripe,Juliana.
ABSTRACT Coastal and marine environments are characterized by a lack of evident physical barriers or geographic isolation, and it may be difficult to understand how divergence can arise and be sustained in marine environments. The identification of 'soft' barriers is a crucial step towards the understanding of gene flow in marine environments. The marine catfishes of the family Ariidae are a demersal group with restricted migratory behavior, no pelagic larval stages, and mechanisms of larval retention, representing a potentially useful model for the understanding of historical processes of allopatric speciation in the marine environment. In the present study, two lineages of the Coco sea catfish, Bagre bagre , were recognized from their complete...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetics; Morphological; Pleistocene; Sea level variations; Species evolution.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200214

Flowing into the unknown: inferred paleodrainages for studying the ichthyofauna of Brazilian coastal rivers
Provedor de dados: 83
Autores: Thomaz,Andréa T.; Knowles,L. Lacey.
ABSTRACT The eastern coastal basins of Brazil are a series of small and isolated rivers that drain directly into the Atlantic Ocean. During the Pleistocene, sea-level retreat caused by glaciations exposed the continental shelf, resulting in enlarged paleodrainages that connected rivers that are isolated today. Using Geographic Information System (GIS), we infer the distribution of these paleodrainages, and their properties for the east Brazilian coast. Specifically, using elevation/bathymetric data for the largest sea-level retreats during the Pleistocene, the paleodrainages, their area and the number of contemporary basins connected by each palaeodrainage, was inferred. For the 145 inferred paleodrainages, total paleodrainage area is strongly correlated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater fishes; Glaciations; Pleistocene; Riverine connections; Sea-level retreat.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000300302

Preliminary investigation on the Pleistocene/Holocene Sea-Level Changes along the Coastline of Tanzania, with reference to Unguja and Pemba  Islands
Provedor de dados: 20
Autores: Nyandwi, N.; Muzuka, A.N.N.; Shaghude, Y.W.
Along the coast of Tanzania, coral reefs, marine terraces and beach ridges are among the most important geomorphological features indicative of the Pleistocene/Holocene sea level changes. Three major terrace units can easily be identified on the mainland coast, namely, Mtoni (youngest), Tanga and Sakura (oldest). Three terrace units have also been identified on the Islands of Unguja and Pemba. On the basis of the difference in the terrace elevations between the two terrace systems it is postulated that the marine terraces on the islands probably represent minor fluctuations of sea level, rather than major phases of sea level fluctuation. A sand beach on the seaward side and several sand ridges on the landward side represent the Recent phase. The oldest...
Tipo: Report
Palavras-chave: Geology; Pleistocene; Holocene.
Ano: 2003
URL: http://hdl.handle.net/1834/818

Molecular Indicators of the Supply of Marine and Terrigenous Organic Matter to a Pleistocene Organic-Matter–Rich Layer in the Alboran Basin (Western Mediterranean Sea)
Provedor de dados: 20
Autores: Rinna, J.; Hauschildt, M.; Rullkötter, J.
The organic matter in sediment series across two organic-matter–rich layers from Ocean Drilling Program Hole 977A drilled in the Alboran Basin of the Western Mediterranean Sea has been characterized by organic geochemical methods. Organic carbon contents reached more than 2% in the organic-matter–rich layer and was ~1% in the background sediment under and overlying it. Molecular compositions of the extractable bitumens in the organic-matter–rich layer for a wide range of compound groups are broadly similar to those of the background sediments. The organic matter in the organic-matter–rich layer is enriched in marine biomarkers, especially long-chain diols and keto-ols and particularly sterols. A higher supply of landderived material to the sediment during...
Tipo: Proceedings Paper
Palavras-chave: Drilling; Pleistocene.
Ano: 1999
URL: http://hdl.handle.net/1834/853

Nota sobre la edad de las calizas coralinas del Pleistoceno marino en las Islas de San Andrés y Providencia (Mar Caribe Occidental, Colombia)
Provedor de dados: 20
Autores: Geister, J.
Los análisis de radiocarbón de tres muestras de corales, tomadas de la terraza terrestre de San Andrés y de su equivalente en Providencia, dieron por resultado edades entre 26.000 y 33.000 años. Estos valores deben considerarse como mínimos, en vista de un posible intercambio significativo de isótopos de carbón, bajo la influencia de la atmósfera, que no se puede excluir por completo.
Tipo: Journal Contribution
Palavras-chave: Limestone; Coral; Pleistocene; Limestone; Http://aims.fao.org/aos/agrovoc/c_4342.
Ano: 1972
URL: http://hdl.handle.net/1834/3329

Crustáceos (Decapoda: Brachyura) fósiles de Cuba.
Provedor de dados: 20
Autores: Varela, C.; Rojas-Consuegra, R.
Three families, two genera and two species are recorded for the first time for the Cuban Cretaceous to Pleistocene geologic age. The genera Persephona Leach, 1817 (Leucosiidae), Mithrax Desmarest, 1823 (Majidae) and Panopeus Milne Edwards, 1834 (Panopeidae) are well known in the Recent of the Caribbean region. Fossils of these taxa are found in formations from lower Miocene to upper Pleistocene in age in the Caribbean. Portunus oblongus Rathbun, 1920, an extinct species, is the first species of Portunus Weber, 1795 recorded from Cuban Oligocene–Miocene. Lophoranina precocious Feldmann, Vega, Tucker, García-Barrera y Avendaño, 1996 (Raninidae), other extinct species, is also recorded for the Cretaceous (Campanian- Maastrichtian). This is the most ancient...
Tipo: Journal Contribution
Palavras-chave: Cretaceous; Oligocene; Miocene; Pleistocene.
Ano: 2009
URL: http://hdl.handle.net/1834/3408

Paleodistribution of Neotropical species of Erythroxylum (Erythroxylaceae) in humid and dry environments
Provedor de dados: 39
Autores: Cordeiro,Luciana Silva; Araújo,Francisca Soares de; Koch,Ingrid; Simões,André Olmos; Martins,Fernando Roberto; Loiola,Maria Iracema Bezerra.
ABSTRACT Variation in environmental conditions during the Quaternary period served as important filters for the maintenance of vegetation types and for determining the composition of the current biota. We analyzed oscillations in the distributions of different vegetation types in Brazil during the Quaternary period using species of the genus Erythroxylum (Erythroxylaceae) because of the vast heterogeneity of habitats in which they occur. We hypothesized that it would be possible to observe geographically distinct distribution patterns of species of Erythroxylum as a result of the climate changes that occurred during the last glacial maximum (LGM) and in the last interglacial period (LIG) of the Pleistocene. We used bioclimatic variables to elaborate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Modeling; Paleoclimates; Vegetation; Pleistocene.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400645

On the taxonomic status of Megatherium sundti Philippi, 1893 (Mammalia: Xenarthra: Megatheriidae)
Provedor de dados: 41
Autores: De Iuliis,Gerardo.
Remains of a medium-sized megathere from Pleistocene deposits near Ulloma, Bolivia, suggest that the commonly accepted synonymy of Megatherium sundti Philippi, 1893 with Megatherium medinae Philippi, 1893 (Mammalia: Xenarthra: Megatheriidae) is unjustified. The strongest evidence supporting the distinction of these species is provided by their femora. In M. medinae the femur is plesiomorphic, bearing nearly parallel lateral and medial margins and an unreduced patellar trochlea. In M. sundti the femur bears strongly concave lateral and medial margins and a somewhat reduced patellar trochlea, resembling the derived condition in Megatherium americanum Cuvier, 1796. Less marked morphological differences in the skull, mandible, and tibia are apparently...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mammalia; Megatheriidae; Megatherium sundti; Megatherium medinae; Taxonomy; Pleistocene; Bolivia.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000100013

Swerving as the escape strategy of Macrauchenia patachonica Owen (Mammalia; Litopterna)
Provedor de dados: 41
Autores: Fariña,Richard A.; Blanco,R. Ernesto; Christiansen,Per.
The Lujanian megamammals (late Pleistocene of South America) show many palaeoautecological peculiarities. The present paper studies one of them, the locomotor habits of Macrauchenia patachonica Owen, through those morphological features related with its possible antipredation strategy. To avoid predation (especially by the sabre-tooth Smilodon Lund), this large litoptern seems to have been particularly adapted to swerving behaviour. This is suggested by the fact that its limb bones have indicators of higher transverse than anteroposterior strength (significantly so in the case of the femur), a feature which is also observed in modern swervers, and not so clearly in other fast running herbivores that do not use swerving so much.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palaeoecology; Megafauna; Pleistocene; South America; Biomechanics; Locomotion.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000400007

Pleistovultur nevesi gen. et sp. nov. (Aves: Vulturidae) and the diversity of condors and vultures in the South American Pleistocene
Provedor de dados: 41
Autores: Alvarenga,Herculano; Brito,Guilherme R.R.; Migotto,Rafael; Hubbe,Alex; Höflibg,Elizabeth.
Pleistovultur nevesi, a new genus and species of a large Vulturidae is described from the Upper Pleistocene or beginning of the Holocene, based on a complete and well preserved right tibiotarsus from the Cuvieri cave deposits, one of the hundreds of caves of the Lagoa Santa region in Minas Gerais state, Brazil. Also described here is a distal half of a left tibiotarsus from Gruta dos Brejões, a cave in Morro do Chapéu, Bahia state, Brazil, which probably belongs to another not-yet-known genus and species of the Vulturidae. The described material, added to prior literature, is proof of the appreciable diversity of the Vulturidae during the Pleistocene in South America.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vulturidae; Pleistocene; South America; Condor; Pleistovultur nevesi; Caves.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000300007

Ancient feeding, ecology and extinction of Pleistocene horses from the Pampean Region, Argentina
Provedor de dados: 41
Autores: Sánchez,Begoña; Prado,José Luis; Alberdi,María Teresa.
To reconstruct the diet and habitat preference of fossil horses, we measured the carbon and oxygen isotope composition of 35 bone and tooth samples of Equus (Amerhippus) neogeus Lund, Hippidion principale (Lund), and Hippidion devillei (Gervais) from 10 different Pleistocene localities in the Pampean region (Argentina). To compare the three species by stratigraphic age, we divided the samples into three groups: lower Pleistocene, middle-late Pleistocene and latest Pleistocene. Samples of Hippidion devillei from the lower Pleistocene were more homogeneous, with &amp;#948;13C values ranging between -11.73 to -9.79&amp;#8240;. These data indicate a diet exclusively dominated by C3 plants. In contrast, Hippidion principale and Equus (Amerhippus) neogeus from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equus (Amerhippus); Hippidion; Paleodiet; Ecology; Extinction; Pleistocene; Papean region; South America.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000200012

Cordão Formation: loess deposits in the southern coastal plain of the state of Rio Grande do Sul, Brazil
Provedor de dados: 42
Autores: LOPES,RENATO P.; DILLENBURG,SERGIO R.; SCHULTZ,CESAR L.
ABSTRACT Loess consists of silt-dominated sediments that cover ~10% of the Earth's surface. In southern South America it occurs in Argentina, Bolivia, Paraguay and Uruguay, and its presence in southern Brazil was never studied in detail. Here is proposed a new lithostratigraphic unit, Cordão Formation, consisting of loess deposits in the southern Brazilian coastal plain. It consists of fine-very fine silt with subordinate sand and clay, found mostly in lowland areas between Pleistocene coastal barriers. These sediments are pale-colored (10YR hue) and forms ~1,5-2,0 meter-thick stable vertical walls. The clay minerals include illite, smectite, interstratified illite/smectite and kaolinite, the coarser fraction is mostly quartz and plagioclase. Caliche and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chuy Creek; Coastal plain; Last glacial stage; Loess; Pleistocene.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602143

A review of the Quaternary Scelidotheriinae (Mammalia, Xenarthra, Tardigrada) from the Tarija-Padcaya basin, Bolivia
Provedor de dados: 42
Autores: MIÑO-BOILINI,ÁNGEL R.; CARLINI,ALFREDO A.; ZURITA,ALFREDO E.; SOIBELZON,ESTEBAN; RODRÍGUEZ-BUALÓ,SANTIAGO M.
ABSTRACT The Mylodontidae Scelidotheriinae (Mammalia, Xenarthra, Tardigrada) are a diversified clade of South American fossil ground sloths, with a wide geographic distribution, especially in high and middle latitudes. According to the last revision, the Quaternary diversity includes the genera Scelidotherium, Catonyx, and Valgipes. The clade Scelidotheriinae is well represented in the Pleistocene of the Tarija-Padcaya basin, and the first mention of these ground sloths correspond to the middle of the XIX Century. Since then, several species (i.e., Scelidotherium tarijensis, Scelidodon tarijensis, Scelidotherium capellini) have been reported as inhabiting the Tarija-Padcaya basin during the Pleistocene. Despite the abundance of fossil records of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catonyx; Diversity; Pilosa; Pleistocene; South America.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400505

Upper Pleistocene deposits of the Comprida Island (São Paulo State) dated by thermoluminescence method
Provedor de dados: 42
Autores: SUGUIO,KENITIRO; TATUMI,SONIA H.; KOWATA,EMÍLIA A.; MUNITA,CASIMIRO S.; PAIVA,ROSEMEIRE P.
The Cananéia (Upper Pleistocene) and the Comprida Island (Holocene) formations, outcropping in the Comprida island (SP) have been mapped using geomorphological and lithological criteria. Only one sample of the Cananéia Formation, collected in the homonymous island in front of the Comprida Island, was beyond the limit of the standard radiocarbon method. But since the publication of the geological map of the area in 1978, there has been some doubt on the real occurrence of Pleistocene deposits in southern extremity of Comprida Island. This paper deals with the results of thermoluminescence (TL) ages of eight samples from Comprida Island, which corroborate the Pleistocene age assumed during mapping surveys of these deposits. On the other hand, possible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermoluminescence ages; Pleistocene; Sea level; São Paulo State.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100010

Luminescence dated Late Pleistocene wave-built terraces in northeastern Brazil
Provedor de dados: 42
Autores: Suguio,Kenitiro; Bezerra,Francisco H.R.; Barreto,Alcina M.F.
This study presents field and chronological investigations along the coast of northeastern Brazil from ~4°S to 9°S latitude, which corresponds to ~700 km of coastline under a semi-diurnal mesotidal regime. We investigated wave-built terrace deposits and dated sediments using the optically stimulated luminescence and thermoluminescence methods on quartz grains. The wave-built terraces yielded two main age groups: 200-230 ka and 100-130 ka, which we interpreted as depositional ages. We correlated these age groups with oxygen-isotope stages 7c and 5e, respectively. These events correspond to the antepenultimate and penultimate transgressions along the Brazilian coast. The deposits occur mainly in patches on low-lying flat plateaus along the littoral zone and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Luinescence dating; Northeastern razil; Pleistocene; Sea-level change.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300011

The sea-level highstand correlated to marine isotope stage (MIS) 7 in the coastal plain of the state of Rio Grande do Sul, Brazil
Provedor de dados: 42
Autores: LOPES,RENATO P.; DILLENBURG,SERGIO R.; SCHULTZ,CESAR L.; FERIGOLO,JORGE; RIBEIRO,ANA MARIA; PEREIRA,JAMIL C.; HOLANDA,ELIZETE C.; PITANA,VANESSA G.; KERBER,LEONARDO.
The coastal plain of the state of Rio Grande do Sul, in southern Brazil, includes four barrier-lagoon depositional systems formed by successive Quaternary sea-level highstands that were correlated to marine isotope stages (MIS) 11, 9, 5 and 1, despite the scarcity of absolute ages. This study describes a sea-level highstand older than MIS 5, based on the stratigraphy, ages and fossils of the shallow marine facies found in coastal barrier (Barrier II). This facies outcrops along the banks of Chuí Creek, it is composed of fine, well-sorted quartz sand and contains ichnofossils Ophiomorpha nodosa and Rosseliasp., and molluscan shells. The sedimentary record indicates coastal aggradation followed by sea-level fall and progradation of the coastline....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barrier II; Chuí Creek; MIS 7; Pleistocene; Paleoceanography.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401573

On the fossil Remains of Panochthus Burmeister, 1866 (Xenarthra, Cingulata, Glyptodontidae) from the Pleistocene of southern Brazil
Provedor de dados: 42
Autores: Ferreira,José D.; Zamorano,Martín; Ribeiro,Ana Maria.
The genus Panochthus represents the last lineage of "Panochthini" recorded in the Pleistocene. This genus has a wide latitudinal distribution in South America, and in Brazil it occurs in the southern and northeastern regions. In this paper we describe new material (isolated osteoderms and caudal tube fragments) assigned to Panochthus from the state of Rio Grande do Sul (southern Brazil) and discuss some taxonomic issues related to Panochthus tuberculatus and Panochthus greslebini based on this material . The occurrence of P. greslebini is the first for outside the Brazilian Intertropical Region. In addition, we describe new diagnostic features to differentiate the osteoderms of P. greslebini and P. tuberculatus. Unfortunately, it was not possible to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glyptodontidae; Panochthus; Pleistocene; Southern Brazil; Osteoderms.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100015

Late Pleistocene carnivores (Carnivora: Mammalia) from a cave sedimentary deposit in northern Brazil
Provedor de dados: 42
Autores: RODRIGUES,SHIRLLEY; AVILLA,LEONARDO S.; SOIBELZON,LEOPOLDO H.; BERNARDES,CAMILA.
The Brazilian Quaternary terrestrial Carnivora are represented by the following families: Canidae, Felidae, Ursidae, Procyonidae Mephitidae and Mustelidae. Their recent evolutionary history in South America is associated with the uplift of the Panamanian Isthmus, and which enabled the Great American Biotic Interchange (GABI). Here we present new fossil records of Carnivora found in a cave in Aurora do Tocantins, Tocantins, northern Brazil. A stratigraphical controlled collection in the sedimentary deposit of the studied cave revealed a fossiliferous level where the following Carnivora taxa were present: Panthera onca, Leopardus sp., Galictis cuja, Procyon cancrivorus, Nasua nasua and Arctotherium wingei. Dating by Electron Spinning Resonance indicates that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carnivora; Fossil record; Pleistocene; South America.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401641

Paleoenvironmental Evolution of Continental Carbonates in West-Central Brazil
Provedor de dados: 42
Autores: OLIVEIRA,EMILIANO C.; ROSSETTI,DILCE F.; UTIDA,GISELLE.
ABSTRACT This paper presents a sedimentological and stratigraphical study of Quaternary (Middle to Late Pleistocene/Holocene) continental carbonates outcrops inside Pantanal Basin and its surroundings, especially in Serra da Bodoquena, Pantanal do Miranda and Corumbá/Ladário plateau, in the state of Mato Grosso do Sul, as well as in Serra das Araras, in the state of Mato Grosso. The aim is to understand the depositional paleoenvironments and analyse climate and tectonic influences in their genesis and evolution. The results show that the deposition of these continental carbonates started in the Middle to Late Pleistocene and have continued, with some interruptions, until the present days. Sedimentary successions were identified in the different areas,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Central Brazil; Continental carbonates; Holocene; Paleoenvironments; Pantanal Basin; Pleistocene.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200407

Seismic Stratigraphy of Pleistocene Deltaic Deposits in Bahía Blanca Estuary, Argentina
Provedor de dados: 42
Autores: ALIOTTA,SALVADOR; GINSBERG,SILVIA S.; GIAGANTE,DARÍO; VECCHI,LAURA G.; SALVATIERRA,MARTA M.
The Bahía Blanca estuary (Argentina) has a morphological configuration resulting from hydrological and sedimentary processes related to Late Quaternary sea level changes. This estuarine system occupies a large coastal plain with a dense net of tidal channels, low-altitude islands and large intertidal flats. Little is known about the sedimentary units of the marine subbottom. Therefore, a stratigraphical analysis of the northern coast of Bahía Blanca estuary was carried out using high resolution seismic (3.5 kHz) in order to: i) define Quaternary sequences, ii) describe sedimentary structures, and iii) determine the paleoenvironmental conditions of sedimentation. The seismic stratigraphic data collected and their correlation with drilling lithological data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bahía Blanca estuary; Deltaic sequences; Marine seismic; Pleistocene; Stratigraphy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200649

The rise and fall of the Refugial Hypothesis of Amazonian speciation: a paleoecological perspective
Provedor de dados: 49
Autores: Bush,Mark B.; Oliveira,Paulo E. de.
The refugial hypothesis is treated as the definitive history of Amazonian forests in many texts. Surprisingly, this important theoretical framework has not been based on paleoecological data. Consequently, a model of Amazonian aridity during the northern hemispheric glaciation has been accepted uncritically. Ironically, the Refuge Hypothesis has not been tested by paleobotanical data. We present a revision of the concept of Neotropical Pleistocene Forest Refuges and test it in the light of paleocological studies derived from pollen analysis of Amazonian lake sediments deposited during the last 20,000 years. Our analysis is based primarily on paleoenvironmental data obtained from sites in Brazil and Ecuador. These data are contrasted with those that favor...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Amazonia; Refugia; Fossil pollen; Glaciations; Pleistocene; Holocene; Miocene; Phylogeny; Speciation diversity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032006000100002