Consulta: subjectFacets:"Miocene"
Registros recuperados: 45
Data/hora: 01/06/2024 13:29:57

Evolution of Late Oligocene - Early Miocene attached and isolated carbonate platforms in a volcanic ridge context (Maldives type), Yadana field, offshore Myanmar
Provedor de dados: 5
Autores: Paumard, Victorien; Zuckmeyer, Eric; Boichard, Robert; Jorry, Stephan; Bourget, Julien; Borgomano, Jean; Maurin, Thomas; Ferry, Jean-noel.
This study investigates the stratigraphic evolution of the Late Oligocene - Early Miocene carbonate platforms of the Yadana area (offshore Myanmar). Well data, regional 2D and local 3D seismic surveys allow the identification of three shallow-water carbonate platforms (Yadana, 3DF and 3DE) showing various morphologic and stratigraphic patterns influenced by the presence of a paleohigh. The identification of seven seismic sequences in the Yadana area constrains the stratigraphic evolution in three stages: (1) development of aggrading attached and isolated platforms during the Chattian; (2) a period of platform emersion during the Oligocene - Miocene transition; (3) drowning of the smaller buildup (3DE) associated with km-scale backstepping on the large...
Tipo: Text
Palavras-chave: Yadana; Carbonate platforms; Oligocene; Miocene; Seismic stratigraphy; Geomorphology; Paleogeography; Control parameters; Burman margin.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00364/47483/47502.pdf

Evolution oligo miocène des marges du micro océan Liguro-Provençal
Provedor de dados: 5
Autores: Bache, François.
The Gulf of Lion margin has been created by an Oligo-Aquitanian rifting followed by oceanic accretion in the Provencal basin during the Burdigalian. Two main periods have been detailed in this thesis:  • The Messinian event that needs to be differentiated from earlier strata deposition. The event also represents a clear marker (between 7 and 5,3 Ma) within the history of the basin.  • The initial period of margin formation, from the beginning of continental extension (35-30 Ma) to oceanisation (around 20 Ma) The database for this study has been built using all available data (seismic and wells from industry) on the shelf, the slope and the deep basin of the Gulf of Lion. The gathering of this huge database occurred in the framework of the French GDRMarges...
Tipo: Text
Palavras-chave: Thermal anomaly; Passive Margins; Subsidence; Rifting; Detritism; Erosion; Salinity Crisis; Miocene; Messinian; Mediterranean; Gulf of Lion; Anomalie thermique; Marges passives; Subsidence; Rifting; Détritisme; Érosion; Crise de salinité; Miocène; Messinien; Méditerranée; Golfe du Lion.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-4768.pdf

Messinian erosional and salinity crises: View from the Provence Basin (Gulf of Lions, Western Mediterranean)
Provedor de dados: 5
Autores: Bache, Francois; Olivet, Jean-louis; Gorini, Christian; Rabineau, Marina; Baztan, Juan; Aslanian, Daniel; Suc, Jean-pierre.
Though the late Miocene "Messinian Salinity Crisis" has been intensely researched along the circum-Mediterranean basins, few studies have focused on the central part of the Mediterranean Basin and, especially, the pre-salt deposits. To improve our knowledge of the Messinian events, it is imperative to better understand this domain. In this study, we provide a more complete understanding of this central domain in the Provence Basin. We were able to recognize: a) thick marine detrital series (up to 1000 m) derived from the Messinian subaerial erosion which is partly prolongated in the distal part by b) a thick unit of deep marine deposits (up to 800 m) prior to the evaporites; c) a thick presumed alternation of detritals and evaporites (1500 m) below the...
Tipo: Text
Palavras-chave: Erosion; Detrital deposits; Miocene; Provence Basin; Mediterranean; Gulf of Lions; Salinity Crisis; Messinian.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6870.pdf

Buried fluvial incisions as a record of Middle-Late Miocene eustasy fall on the Armorican Shelf (Bay of Biscay, France)
Provedor de dados: 5
Autores: Paquet, Fabien; Menier, David; Estournes, Guilhem; Bourillet, Jean-francois; Leroy, Pascal; Guillocheau, Francois.
High-resolution seismic data have been acquired in June 2008 on the Armorican Shelf (AS), in the northern Bay of Biscay, in order to reassess its stratigraphic architecture in detail and to study the impact of eustasy, tectonic and sediment delivery on the margin sedimentary record. Several profiles show fluvial-type incisions of several tens of meters (up to 54 m) associated to a widespread erosion surface. Several hypotheses are proposed for the stratigraphic position of this surface and incisions. We suggest Middle to Late Miocene age. Considering the relatively quiescent tectonic activity of the margin, we infer that the relative sea-level fall responsible of aerial incision on the Miocene shelf is eustasy-related. We propose the attested...
Tipo: Text
Palavras-chave: Armorican Shelf; Incised valleys; Miocene; Eustasy; Passive margin.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00001/11200/8048.pdf

Tectonic inheritance and Pliocene-Pleistocene inversion of the Algerian margin around Algiers: Insights from multibeam and seismic reflection data
Provedor de dados: 5
Autores: Strzerzynski, Pierre; Deverchere, Jacques; Cattaneo, Antonio; Domzig, Anne; Yelles, Karim; De Lepinay, Bernard Mercier; Babonneau, Nathalie; Boudiaf, Azzedine.
The Algerian margin has originated from the opening of the Algerian basin about 25-30 Ma ago. The central margin provides evidence for large-scale normal faults of Oligo-Miocene age, whereas transcurrent tectonics characterizes the western margin. A set of NW-SE oriented dextral transform faults was active during basin opening and divided the 600 km long central margin into segments of similar to 120-150 km. The upper Miocene, Plio-Quaternary, and present-day tectonic setting is, however, compressional and supports the occurrence of a margin inversion, a process still poorly documented worldwide. We show that the central Algerian margin represents a rare example of inverted margin, where the process of subduction inception is particularly well expressed...
Tipo: Text
Palavras-chave: Messinian salinity crisis; Western mediterranean sea; Northern algeria; Intraplate deformation; Incipient subduction; Plate kinematics; Salt tectonics; Boundary; Basin; Miocene.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00008/11883/9286.pdf

The stratigraphy and regional structure of Miocene deposits in western Amazonia (Peru, Colombia and Brazil), with implications for late Neogene landscape evolution
Provedor de dados: 16
Autores: Wesselingh, F.P.; Hoorn, M.C.; Guerrero, J.; Räsänen, M.E.; Romero Pittmann, L.; Salo, J.A.
A biozonation based on molluscs is proposed for Miocene deposits of western Amazonia (Peru, Colombia and Brazil), commonly referred to as the Pebas Formation. The new zonation refines existing pollen zonations and provides a key for the quick assessment of the stratigraphic position of Neogene deposits in the field. The regional distribution of twelve mollusc zones reveals a structuring of geological units around the broad Iquitos-Araracuara anteclise. The structure of the subsurface appears to have been a major factor in the determination of present-day second and lower order river courses in the study area. Based on this work a biostratigraphic framework for Miocene deposits of western Amazonia, including fossiliferous deposits from adjacent basins...
Tipo: Article / Letter to the editor
Palavras-chave: Stratigraphy; Mollusca; Miocene; Western Amazonia; Pebas Formation; 42.73; 38.22.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209729

A Miocene perspective on the evolution of the Amazonian biota
Provedor de dados: 16
Autores: Wesselingh, F.P.; Salo, J.A.
Between c. 23 and 8 Ma, western Amazonia was occupied by the vast Pebas long-lived lake/wetland system. The Pebas system had a variety of influences over the evolution of Miocene and modern Amazonian biota; it formed a barrier for the exchange of terrestrial biota, a pathway for the transition of marine biota into freshwater Amazonian environments, and formed the stage of remarkable radiations of endemic molluscs and ostracods. The lithological variation of the Pebas Formation has furthermore enhanced edaphic heterogeneity in western Amazonia, sustaining present-day high terrestrial diversity in the region.
Tipo: Article / Letter to the editor
Palavras-chave: Miocene; Amazonia; Biogeography; Biodiversity; Mollusca; 42.73; 38.22.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209738

Crustaceans of the upper Miocene August Town Formation of southeastern Jamaica
Provedor de dados: 16
Autores: Collins, J.S.H.; Donovan, S.K.; Stemann, T.A.; Blissett, D.J.
Crustaceans remain poorly known from the Miocene of Jamaica. Herein, we report three species from the upper Miocene August Town Formation of Fowl House Spring, parish of St. Thomas, southeast Jamaica; poorly preserved propodi of a mud shrimp, “Callianassa” sp.; the anterior part of the carapace of Mithraculus sp. aff. Mithraculus coryphe (Herbst); and the cirripede Tetraclita sp. cf. T. stalactifera (Lamarck). Mithraculus sp. aff. M. coryphe at Fowl House Spring considerably extends the stratigraphic occurrence of the genus in the Antillean region down into the Miocene. Hitherto, fossil T. stalactifera in the Caribbean was known from the Plio-Pleistocene of Curaçao and the Pleistocene of Venezuela.
Tipo: Article / Letter to the editor
Palavras-chave: Jamaica; Miocene; Barnacles; Cirripedia; Crabs; Decapoda; 38.22.
Ano: 2010
URL: http://www.repository.naturalis.nl/record/361979

New Odostomia species (Gastropoda, Heterobranchia, Pyramidellidae) from the Miocene Pebas Formation of Western Amazonia (Peru, Colombia)
Provedor de dados: 16
Autores: Aartsen, J.J. van; Wesselingh, F.P.
Odostomia nuttalli spec. nov. and O. coluhensis spec. nov. are described from the Miocene Pebas Formation of Peruvian and Columbian Amazonia. A third pyramidellid snail is also diagnosed. These species are indicators for marine influence in the late Middle to early Late Miocence of Western Amazonia. Some ecological implications are discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Mollusca; Gastropoda; Odostomia; Systematics; Miocene; Amazonia; Pebas Formation; 38.22; 42.73.
Ano: 2000
URL: http://www.repository.naturalis.nl/record/235155

Insectivores (Lipotyphla, Mammalia) from the Ramblian of the Daroca-Calamocha area
Provedor de dados: 16
Autores: Hoek Ostende, L.W. van den.
The insectivore assemblages from the Ramblian stratotype near Calamocha (Spain) are described, as well as those from San Roque 4A and 4B, two Ramblian localities near the Aragonian stratotype. Two new species are described, the erinaceid Galerix remmerti, and the shrew Clapasorex alvarezae. Both the percentages and the diversity of insectivores are higher in the Lower Ramblian, suggesting more humid conditions in zone Z than in zone A. This is in contradiction with the palaeoenvironmental reconstructions based on rodents.     Se describen las asociaciones de insectívoros del estratotipo del Rambliense cerca de Calamocha (Teruel, España), junto de las de San Roque 4A y 4B, dos yacimientos Ramblienses del área-tipo del Aragoniense. Se describar dos especies...
Tipo: Article / Letter to the editor
Palavras-chave: Ramblian; Miocene; Insectivora; 38.22; 42.84.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/327729

[The fossil record of the Eurasian Neogene insectivores (Erinaceomorpha, Soricomorpha, Mammalia) : Part I / L.W. van den Hoek Ostende, C.S. Doukas and J.W.F. Reumer (editors)]: Germany
Provedor de dados: 16
Autores: Ziegler, R.; Dahlmann, Th.; Reumer, J.W.F.; Storch, G.
Introduction Research of Miocene and Pliocene insectivores has a long history in Germany. Already in the middle of the 19th century Miocene insectivore species have been described from South German localities. Most of these were authored by Herman von Meyer, who deserves to be named a pioneer of German insectivores research. Weisenau, today part of the city of Mainz, is the type locality of Dimylus paradoxus described by von Meyer (1846:473). Haslach near Ulm yielded the type of Cordylodon haslachensis, also described by von Meyer (1859: 174). The widely known Steinheim fauna yielded among others the type of Parasorex socialis, again described by von Meyer (1865:884). Von Meyer often received fossils from private collectors for determination. Usually, he...
Tipo: Article / Letter to the editor
Palavras-chave: Insectivores; Miocene; Pliocene; Germany; 38.22.
Ano: 2005
URL: http://www.repository.naturalis.nl/record/317359

Landscape evolution and depositional processes in the Miocene Amazonian Pebas lake/wetland system: evidence from exploratory boreholes in northeastern Peru.
Provedor de dados: 16
Autores: Wesselingh, F.P.; Guerrero, J.; Räsänen, M.E.; Romero Pittmann, L.; Vonhof, H.B.
This study of the type and scales of depositional processes and landscape development in western Amazonia during the Miocene is based on the description and interpretation of three boreholes from the Marañon basin (Peru). The Miocene Pebas Formation, and the overlying Marañon Formation and underlying Chambira Formation are lithologically characterised. An age calculation model indicates an Oligocene age for the Chambira Formation, and an Early – early late Miocene age for the Pebas Formation. The base of the Chambira Formation is placed at a sequence boundary and corresponds to the beginning of a regression. The succession was deposited in floodplains included in a RST and a LST under a seasonal climate with a pronounced dry season. The base of the Pebas...
Tipo: Article / Letter to the editor
Palavras-chave: Miocene; Marañon basin; Peru; Pebas Formation; Chambira Formation; Stratigraphy; 38.16.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209731

A Miocene molluscan faunule from Caucagua (Miranda State, Venezuela), with the description of a new species of Tryonia (Mollusca, Gastropoda)
Provedor de dados: 16
Autores: Wesselingh, F.P.; Macsotay, O.
A molluscan faunule from the Miocene Cumaca Formation of the western margin of the Tuy Basin (Venezuela) is described. The fauna yields two species of freshwater snails and a single terrestrial snail species. Tryonia vivasi nov. spec. is described from the fauna, and its biogeographical significance is discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Miocene; Venezuela; Gastropoda; Tryonia; New species; Cumaca Formation; 42.73; 38.22.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/235213

A new short-rostrum odontocete (Mammalia: Cetacea) from the middle Miocene of the Eastern Netherlands
Provedor de dados: 16
Autores: Bianucci, G.; Landini, W.
An incomplete odontocete (Mammalia, Cetacea) skull from Middle Miocene Miste Bed (near Winterswijk in the eastern part of The Netherlands) is described as Vanbreenia trigonia, a new genus and species. The skull exhibits a short rostrum with only two maxillary teeth for each toothrow and with narrow and toothless apical portion exclusively formed by the premaxilla. Considering this last character, the specimen could belong to the Eurhinodelphinidae even if a certain attribution is not possible because of the incompleteness of the specimen. Vanbreenia n. gen. could represent a specialized adaptation to bottom suction feeding among the eurhinodelphinids.
Tipo: Article / Letter to the editor
Palavras-chave: Cetacea; Odontocete; Systematics; Feeding; Miocene; The Netherlands.
Ano: 2002
URL: http://www.repository.naturalis.nl/record/505053

The identity of Isocrassina, Laevastarte and Ashtarotha (Mollusca, Bivalvia, Astartidae) and their representatives from beaches and estuaries in The Netherlands and Pliocene strata in Belgium
Provedor de dados: 16
Autores: Pouwer, R.
The identity of the subgenera Isocrassina Chavan, 1950, Laevastarte Hinsch, 1952, and Ashtarotha Dall, 1903, of the genus Astarte Sowerby, 1816 in the family Astartidae (Mollusca, Bivalvia) is discussed. Isocrassina has been widely used for Pliocene species in the North Sea Basin. Here it is demonstrated, that this is based on a redefinition of this subgenus, which excludes its type-species. As the North Sea species differ considerably from the type-species of Isocrassina in aspects of ornament and details of the hinge, it is concluded that they should be placed in the genus Laevastarte. A slightly modified definition of Isocrassina and Laevastarte is given and both are raised to genus level. The morphological basis for Ashtarotha is quite weak and it is...
Tipo: Article / Letter to the editor
Palavras-chave: Bivalvia; Astartidae; Astarte; Isocrassina; Laevastarte; Ashtarotha; Pliocene; Miocene; North Sea Basin; Systematics; New taxa; Neotype designation; 42.73; 38.22.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/347006

On relict hydrobiid species in Brazilian Amazonia (Gastropoda, Prosobranchia, Hydrobiidae)
Provedor de dados: 16
Autores: Wesselingh, F.P.
Two extant hydrobiid species from the lower Tapajos river of Brazil are redescribed. Potamopyrgus amazonicus Haas, 1949, is assigned to the genus Dyris Conrad, 1871. At least eleven species from Miocene deposits of Western Amazonia are assigned to Dyris, a genus that was previously assumed to be extinct. The apertural features of Sioliella effusa Haas, 1949, are considered indicative of a close relationship to Miocene Amazonian taxa formaly assigned to Eubora Kadolsky, 1980. Sioliella ovata spec. nov., a Miocene species resembling S. effusa is described. The two Tapajos species can be regarded as relicts of a speciose, endemic, Miocene Western Amazonian molluscan fauna.
Tipo: Article / Letter to the editor
Palavras-chave: South America; Amazonia; Miocene; Recent; Hydrobiidae; Dyris; Sioliella; New species; 42.73; 38.22.
Ano: 2000
URL: http://www.repository.naturalis.nl/record/235203

Reappearance of Galerix (Erinaceomorpha, Mammalia) at the Middle to Late Miocene transition in South Germany: biostratigraphic and palaeoecologic implications
Provedor de dados: 16
Autores: Prieto, J.; Hoek Ostende, L.W. van den; Böhme, M.
The presence of Galerix molars in the South German fossil locality Hammerschmiede 3 is interpreted as evidence for a reimmigration of West European origin into the North Alpine Foreland Basin at the transition of the Middle to Late Miocene. The brief re-appearence of Galerix in southern Germany can be used as a biostratigraphic marker that allows promising correlations between local biostratigraphic subdivisions from Spain and Germany, suggesting that, contrary to previous thought, the Hammerschmiede locality may antedate the hipparionine horses’ appearance event. Based on the supposed climatic adaptation of galericine taxa and lower vertebrate record, it is hypothesized that short term climatic fluctuations occurred in South Germany around the time of the...
Tipo: Article / Letter to the editor
Palavras-chave: Climate fluctuation; Erinaceidae; Miocene; Northern Alpine Foreland Basin; 42.84.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/387431

Indarctos (Ursidae, Mammalia) from the Spanish Turolian (Upper Miocene)
Provedor de dados: 16
Autores: Montoya, P.; Alcalá, L.; Morales, J.
Abundant fossils of the bear Indarctos atticus (Weithofer, 1888) from the Lower Turolian (MN11) site of Crevillente 2 (Alicante, Spain) and some new material from the Middle Turolian (MN12) of Concud and Valdecebro 5 (Teruel, Spain) are described. On the other hand some dental remains from Crevillente 2 are identified as Indarctos sp. cf. I. vireti Villalta &amp; Crusafont, 1943 on the basis of their small size. The status of different Indarctos species are discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Mammalia; Ursidae; Miocene; Spain; 42.84; 38.22.
Ano: 2001
URL: http://www.repository.naturalis.nl/record/219159

El sistema de yacimientos de mamíferos miocenos del Cerro de los Batallones, Cuenca de Madrid: estado actual y perspectivas
Provedor de dados: 16
Autores: Morales, J.; Pozo, M.; Silva, P.G.; Domingo, M.S.; López-Antoñanzas, R.; Álvarez Sierra, A.; Antón, M.; Martín Escorza, C.; Quiralte, V.; Salesa, M.J.; Sánchez, I.M.; Azanza, B.; Calvo, J.P.; Carrasco, P.; García-Paredes, I.; Knoll, F.; Hernández Fernández, M.; Hoek Ostende, L.W. van den; Merino, L.; Meulen, A.J. van der; Montoya, P.; Peigné, S.; Peláez-Campomanes, P.; Sánchez-Marco, A.; Turner, A.; Abella, J.; Alcalde, G.M.; Andrés, M.; DeMiguel, D.; Cantalapiedra, J.L.; Fraile, S.; García Yelo, B.A.; Gómez Cano, A.R.; López Guerrero, P.; Oliver Pérez, A.; Siliceo, G.
The Cerro de los Batallones (Los Batallones Butte) is located in the central-northern area of the Madrid Basin, central Spain. Nine vertebrates localities containing a large variety of mammals of Upper Vallesian Age (Late Miocene) have been found associated with the sediments forming the butte. From bottom to top, these sediments consist of magnesian lutite beds (Unit I), paleosols formed of sepiolite and opal (Unit II), and siliclastic, marlstone and carbonate beds (Unit III). The set of ERT profiles developed in Los Batallones Butte have demonstrate that electrical imaging techniques are an estimable tool for the characterization and prospecting of fossil sites developed in fine-grained siliciclastic sequences. These localities contain an exceptionally...
Tipo: Part of book or chapter of book
Palavras-chave: Mammalia; Miocene; Cerro de los Batallones; 38.22; 42.84.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/327989

A new species of Sphenotrochus (Scleractinia: Turbinoliidae) from the Late Miocene (Tortonian) of Chile
Provedor de dados: 16
Autores: Cairns, S.D.
A new species of azooxanthellate Scleractinia, Sphenotrochus denhartogi, is described from the Late Miocene (Tortonian, Navidad Formation) of Chile. Comparisons are made to three other closely related species which, based on their distinctive costal morphology, form a species complex: S. claibornensis, S. senni, S. denhartogi, and S. auritus. This is the first record of Sphenotrochus from the west coast of South America.
Tipo: Article / Letter to the editor
Palavras-chave: Scleractinia; Turbinoliidae; Miocene; Tortonian; Navidad Formation; Sphenotrochus denhartogi spec. nov.; Chile; 42.79.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/220295

Molluscan radiations and landscape evolution in Miocene Amazonia
Provedor de dados: 16
Autores: Wesselingh, F.P.
This PhD study aims to exploit the rich archive provided by the Miocene mollusc fauna of the Pebas Formation and other inland Miocene Amazonian formations to reconstruct landscape evolution and biotic development in lowland Amazonia during the Neogene. Over 160 samples from more than 70 Pebas Formation outcrops mostly collected by the author were processed for this study. Additional samples were collected in Andean areas of Colombia and Venezuela and further material from other northwestern South American basins was studied in museums. Pebas Formation samples and well log data made available by Occidental Peru from three wells in the Marañon Basin in Peru were also investigated.     During this study four genera and 74 species from the Pebas Formation have...
Tipo: Book (monograph)
Palavras-chave: Amazonian biodiversity; Miocene; Mollusc fauna; Pebas Formation; 42.73.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/307030

Miocene freshwater Mollusca from western Brazilian Amazonia
Provedor de dados: 16
Autores: Wesselingh, F.P.; Ranzi, A.; Räsänen, M.E.
Thirteen species of fossil molluscs are reported from the Solimões Formation of western Brazilian Amazonia. Based on mammalian chronology of the Solimões Formation and radiometric ages reported from coeval deposits in adjacent Peru, the age of the fauna is established as Late Miocene. The fauna includes five prosobranch gastropod species, seven pearly freshwater mussel species and one sphaeriid bivalve species. The supposed presence of Pachydon (Corbulidae: Bivalvia) in these deposits is rejected; Pachydon acreanum, whose status has long been uncertain, is transferred to the unionoid genus Callonaia. The Solimões mollusc fauna is entirely composed of obligate freshwater taxa, resembling species-poor modern Amazonian fluvial faunas. The presence of the...
Tipo: Article / Letter to the editor
Palavras-chave: Mollusca; Western Amazonia; Miocene; Solimões Formation.; 38.22; 42.73.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209736

A redescription of the Indo-West Pacific Spirobranchus corrugatus Straughan, 1967 (Serpulidae, Polychaeta), and an alternative hypothesis on the nature of a group of Middle Miocene microfossils from Poland
Provedor de dados: 16
Autores: Hove, Harry A. ten; Nishi, Eijiroh.
Spirobranchus corrugatus, a little known species, is redescribed based on ample material from Australia, Indonesia, Japan and the Seychelles. The species is characterized by a seemingly porous tube, sunk into the substrate. Characteristically, the opercular plate shows a number of radial ridges on its distal surface, resembling Middle Miocene microfossils from Poland. The ventral rim of the opercular bulb of Sp. corrugatus bears numerous ocelli, with single lenses. A comparison with similar species is given.
Tipo: Article / Letter to the editor
Palavras-chave: Polychaeta; Serpulidae; Indo-Pacific; Miocene; Poland.
Ano: 1996
URL: http://www.repository.naturalis.nl/record/505214

Attempts to predate on gadid fish otoliths demonstrated by naticid gastropod drill holes from the Neogene of Mill-Langenboom, The Netherlands
Provedor de dados: 16
Autores: Gaemers, P.A.M.; Langeveld, B.W.
Incomplete drill holes produced by naticid snails are occasionally found in late Cenozoic gadid otoliths from the North Sea Basin. Among the Neogene otoliths found at Mill-Langenboom naticid drill holes are relatively common. Their occurrence is linked to strata that formed under reduced rates of sedimentation and/or that reflect non-sedimentation and erosion. The Upper Miocene–Upper Pliocene deposits at Mill-Langenboom (province of Noord-Brabant, the Netherlands) constitute a condensed sequence comprising most North Sea Basin stages of this interval from the Gramian to the end of the Pliocene, as demonstrated by index taxa amongst gadid otoliths, with a considerable hiatus between Miocene and Pliocene strata. The lag deposit at the base of the Pliocene...
Tipo: Article / Letter to the editor
Palavras-chave: Miocene; Pliocene; Noord-Brabant; Palaeoecology; Biostratigraphy; Chronostratigraphy; North Sea Basin.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/607550

Seagrass mollusks as a model group for paleoecological and paleodiversity studies = Weekdieren van het zeegras als modelgroep voor paleomilieu en biodiversiteit studies = Seegrass Mollusken als Modelgruppe für Studien der Paläoökologie und Paläodiversität
Provedor de dados: 16
Autores: Reich, S.
Today’s global marine diversity hotspot, or center of maximum biodiversity, is located in the Indo-West Pacific (IWP), namely in the Indo-Malayan region, including Malaysia, the Philippines, Indonesia, and Papua New Guinea (Hoeksma, 2007; Renema et al., 2010). Numerous groups of marine organisms, for instance foraminifera, mollusks, and corals contribute to the high taxonomic richness (e.g., Bellwood et al., 2005; Hoeksema, 2007; Kohn, 1990; Wilson and Rosen, 1998). The exceptional biodiversity in the region is thought to have originated in the Early Neogene with the diversification of scleractinian coral reefs and associated organisms (e.g., Wilson and Rosen, 1998; Chapter 6). Because the available fossil data to document patterns of diversification of...
Tipo: Book (monograph)
Palavras-chave: Miocene; Marine Mollusca; Indonesia; 42.73.
Ano: 2014
URL: http://www.repository.naturalis.nl/record/482553

The Miocene fish Marosichthys, a putative tetraodontiform, actually a perciform surgeon fish (Acanthuridae) related to the recent Naso
Provedor de dados: 16
Autores: Tyler, James C.
Marosichthys huismani (de Beaufort, 1926), a fish from the Miocene of the Celebes, was described in the tripod fish family Triacanthidae, Tetraodontiformes. It is shown here to be a valid genus of the surgeon fish family Acanthuridae, Perciformes, and closely related to the Recent genus Naso. Marosichthys is unique among all acanthurids in having the ventral shafts of the first two basal pterygiophores of the spiny dorsal fin in the preneural space (versus only one in front of the first neural spine) and no vacant interneural spaces (versus the third space vacant).
Tipo: Article / Letter to the editor
Palavras-chave: Surgeon fishes; Acanthuridae; Marosichthys; Miocene; Triacanthidae.
Ano: 1997
URL: http://www.repository.naturalis.nl/record/504721

Proboscidea (Mammalia) from the Upper Miocene of Crevillente (Alicante, Spain)
Provedor de dados: 16
Autores: Mazo, A.V.; Montoya, P.
The fossil Proboscidea from the Spanish Turolian (Upper Miocene) sites of Crevillente 2 (MN11) and Crevillente 15 and 16 (MN12) are described. The mastodont from Crevillente 2 is assigned to Tetralophodon cf. longirostris ‘grandincisivoid form’, recognised for the first time in the Iberian Peninsula, and that from Crevillente 16 to Tetralophodon longirostris. The Deinotheriidae from Crevillente 2 and Crevillente 15 are identified as Deinotherium giganteum and Deinotherium sp., respectively. The status of ‘Mastodon’ grandincisivus and the ‘grandincisivoid forms’ of Gomphotherium and Tetralophodon are discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Proboscidea; Tetralophodon; Deinotherium; Miocene; Spain; 42.84; 38.22.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/219296

Evolutionary ecology of the Pachydontinae (Bivalvia, Corbulidae) in the Pebas lake/wetland system (Miocene, western Amazonia)
Provedor de dados: 16
Autores: Wesselingh, F.P.
Miocene deposits in western Amazonia and adjacent areas of South America harbour a diverse suite of endemic corbulid bivalves, commonly referred to as Pachydontinae, that show a wide variety of morphologies. Especially in the Miocene Pebas Formation (Peru, Colombia and Brazil), this group diversified spectacularly. Since these corbulids (a cosmopolitan marine and perimarine bivalve family) occur with freshwater taxa and yield isotope signals strongly indicative of freshwater settings, the success of this group in inland basins of Miocene northwestern South America is surprising. In this paper it is argued that a combination of adaptations to fluid bottom substrates, common dysoxia and high predation intensities explains their abundance, their morphological...
Tipo: Article / Letter to the editor
Palavras-chave: Corbulidae; Pachydontinae; Miocene; Amazonia; Evolution; Adaptation; 42.73; 38.22.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209734

The nature of aquatic landscapes in the Miocene of western Amazonia: an integrated palaeontological and geochemical approach
Provedor de dados: 16
Autores: Wesselingh, F.P.; Kaandorp, R.J.G.; Vonhof, H.B.; Räsänen, M.E.; Renema, W.; Gingras, M.
The Miocene Pebas Formation from the section Santa Rosa de Pichana (Loreto, Peru) was investigated using a combination of analyses of sedimentary facies, molluscan communities and taphonomy, and stable isotopes of both entire shells and growth bands in bivalves. Three sequences, comprising a succession of transgressive, maximum flooding and regressive/prograding intervals, are documented. Molluscs are most common in the transgressive/highstand intervals and are almost absent in regressive/prograding intervals. The fauna is dominated by endemic Pebasian species, such as Pachydon and Dyris spp. The nature of the deposits as well as the availability of oxygen varied in a predictable way within each of the sequences and determined the nature of the...
Tipo: Article / Letter to the editor
Palavras-chave: Miocene; Amazonia; Palaeoecology; Sedimentology; Stable isotopes; 38.22; 42.73.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209732

Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia
Provedor de dados: 16
Autores: Wesselingh, F.P.; Anderson, L.C.; Kadolsky, D.
The mollusc fauna of the Miocene Pebas Formation of Peruvian and Colombian Amazonia contains at least 158 mollusc species, 73 of which are introduced as new; 13 are described in open nomenclature. Four genera are introduced (the cochliopid genera Feliconcha and Glabertryonia, and the corbulid genera Pachyrotunda and Concentricavalva) and a nomen novum is introduced for one genus (Longosoma). A neotype is designated for Liosoma glabra Conrad, 1874a. The Pebas fauna is taxonomically dominated by two families, viz. the Cochliopidae (86 species; 54%) and Corbulidae (23 species; 15%). The fauna can be characterised as aquatic (155 species; 98%), endemic (114 species; 72%) and extinct (only four species are extant). Many of the families represented by a few...
Tipo: Article / Letter to the editor
Palavras-chave: Mollusca; Systematics; Pebas Formation; Miocene; Western Amazonia; 42.73; 38.22.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209728

Miocene long-lived lake Pebas as a stage of mollusc radiations, with implications for landscape evolution in western Amazonia
Provedor de dados: 16
Autores: Wesselingh, F.P.
The Miocene Pebas system was a huge (&gt; 1 million km2) system of long-lived lakes and wetlands that occupied most of western Amazonia between c. 23 and 8 Ma. Remarkable endemic radiations of molluscs and ostracods occurred in the Pebas system. The continuity of many of the endemic lineages between c. 17 and 9 Ma shows that the system was never fully replaced by fluvial or marine settings. Many of the endemic invertebrate groups developed an unusual range of morphologies that reflect adaptation to specific ecological stresses provided by the Pebas system, such as chemical stress, common dysoxia and high predation pressure. Mollusc diversity increased especially during the Middle Miocene. The Pebas system provided pathways for mobile marine organisms to...
Tipo: Article / Letter to the editor
Palavras-chave: Miocene; Amazonia; Molluscs; Landscape evolution; Pebas Formation; 42.73; 38.22.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209724

Systematic ichnology of microborings from the Cenozoic White Limestone Group, Jamaica, West Indies
Provedor de dados: 16
Autores: Blissett, D.J.; Pickerill, R.K.
The Middle Eocene to Middle Miocene White Limestone Group of Jamaica contains a common and diverse, poorly to well-preserved microboring ichnofauna, namely Centrichnus eccentricus Bromley &amp; Martinell, Curvichnus pediformis isp. nov., Dendrorete balani Tavernier, Campbell &amp; Golubic, Dipatulichnus rotundus Nielsen &amp; Nielsen, Entobia volzi Bromley &amp; D’Alessandro, Entobia isp. cf. E. ovula Bromley &amp; D’Alessandro, Entobia isp. forms A and B, Fossichnus solus Nielsen, Nielsen &amp; Bromley, Maeandropolydora elegans Bromley &amp; D’Alessandro, Maeandropolydora sulcans Voigt, Oichnus asperus Nielsen &amp; Nielsen, Oichnus excavatus Donovan &amp; Jagt, Oichnus gradatus Nielsen &amp; Nielsen, Oichnus ovalis Bromley, Oichnus paraboloides Bromley,...
Tipo: Article / Letter to the editor
Palavras-chave: Ichnotaxonomy; Microborings; Jamaica; West Indies; Eocene; Oligocene; Miocene; 38.20.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/217416

Insectivores (Erinaceomorpha, Soricomorpha; Mammalia) from Karydia and Komotini (Thrace, Greece; MN 4/5)
Provedor de dados: 16
Autores: Doukas, C.S.; Hoek Ostende, L.W. van den.
The insectivores from the Thrace locality of Karydia (MN 4) are described, as well as an erinaceid molar from thenearby locality of Komotini (MN 5). The Karydia assemblagecontains the same genera of the Greek MN 4 localityAliveri, with the addition of a shrew and of Plesiosorex. An M2 of the latter is the southernmost occurrence of this genus, and the first record from the Mediterranean area. At the species level there are differences between Karydia and Aliveri. As Galerix kostakii n.sp. from Karydia is interpreted as a descendant of G. symeonidisi from Aliveri, a younger age for the Thrace locality, as was already assumed on the basis of the rodents, is confirmed. A model is proposed in which the symeondisi-kostakii lineage gives rise to Parasorex, of...
Tipo: Article / Letter to the editor
Palavras-chave: Insectivores; New species; Evolution; Miocene; Greece; 38.22; 42.84.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/327718

Distribution and evolutionary history of the Early Miocene erinaceid Galerix symeonidisi Doukas, 1986
Provedor de dados: 16
Autores: Hoek Ostende, L.W. van den; Doukas, C.S.
The distribution of the Early Miocene galericine Galerix symeonidisi, with records from Greece, Germany, Spain and Austria is discussed. The identification of G. cf. symeonidisi from the Anatolian Çankiri basin is changed into G. cf. uenayae on the basis of additional material. Galerix symeonidisi enters Europe at the MN 3/ MN 4 transition. Differences in the pattern of replacement of the preceding Galerix species in Germany and Spain suggest that ecological factors played a role in that replacement. Galerix symeonidisi is succeeded by G. exilis in Western and Central Europe. A G. symeonidisi - G. exilis lineage, as has been proposed in literature, is rejected. The record from the Daroca-Calamocha area (Spain) is instead interpreted as a case of gradual...
Tipo: Article / Letter to the editor
Palavras-chave: Evolutionary history; Galerix; Miocene; 38.22; 42.84.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/327789

Teredolites longissimus Kelly &amp; Bromley from the Miocene Grand Bay Formation of Carriacou, the Grenadines, Lesser Antilles
Provedor de dados: 16
Autores: Pickerill, R.K.; Donovan, S.K.; Portell, R.W.
The ichnotaxon Teredolites Leymerie, 1842, represented by T. longissimus Kelly &amp; Bromley, 1984, is documented for the first time from the Lesser Antilles. Its occurrence also represents the first record of the ichnotaxon from the Miocene of the Caribbean. Five specimens, each occurring in isolation without an enclosing xylic (wood) substrate, but merely calcite-lined tubes, occur in the Miocene Grand Bay Formation of Carriacou, the Grenadines, Lesser Antilles. Stratinomic considerations suggest that following physical destruction or biological decomposition of their enclosing substrate(s), the tubes may have accumulated in relatively shallow water only to be subsequently resedimented into a deeperwater (&gt; 150 m) environment.
Tipo: Article / Letter to the editor
Palavras-chave: Teredolites; Ichnology; Miocene; Lesser Antilles; Systematics; 42.71; 38.22.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/219214

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

Crustáceos fósiles (Decapoda: Brachyura) de la Formación Colón, Matanzas, Cuba
Provedor de dados: 20
Autores: Rojas Consuegra, R.; Varela, C.
Three families, four genera and four species of fossil crustacean (Decapoda: Brachyura) were studied. The following taxa are recorded for the first time for the Cuban Oligocene-Miocene belonging to Colon formation, Matanzas, Cuba: Raninoides sp. (Raninidae), Necronectes collinsi Schweitzer et al. (Portunidae), Iliacantha liodactylus Rathbun (Leucosiidae) and Hepatus sp. (Aethridae).
Tipo: Journal Contribution
Palavras-chave: 1283; Crustaceans; New records; Oligocene; Miocene; New taxa; Cuba; Decapoda; Brachyura; Http://aims.fao.org/aos/agrovoc/c_1997; Http://aims.fao.org/aos/agrovoc/c_2141; Http://aims.fao.org/aos/agrovoc/c_47038.
Ano: 2011
URL: http://hdl.handle.net/1834/4062

Miocene fern spores and pollen grains from the Solimões Basin, Amazon Region, Brazil
Provedor de dados: 39
Autores: Sá,Natália de Paula; Carvalho,Marcelo de Araújo.
ABSTRACT This work documents fern spores and pollen grains (miospores) recovered from rocks of the Solimões Formation (Solimões Basin), their botanical affinities, ecology and distribution in the Miocene of the Amazon Region. The assemblage of miospores is well preserved and diverse. They are identified, illustrated and assigned to the ten families of ferns and 22 families of spermatophytes. All miospores were identified to the taxonomic level of species except for two taxa (Perinomonoletes and Podocarpidites). The families Pteridaceae and Arecaceae were most representative of ferns and spermatophytes, respectively. This work contributes to the knowledge of the paleoflora and will aid in paleoenvironmental, paleoecological and biostratigraphic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Miocene; Miospores; Neogene; Palynology; Solimões; Vegetation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400720

Ichnology of the Lower Miocene Chenque Formation, Patagonia, Argentina: animal - substrate interactions and the Modern Evolutionary Fauna
Provedor de dados: 41
Autores: Carmona,Noelia B.; Buatois,Luis A.; Mángano,María Gabriela; Bromley,Richard G.
The lower Miocene Chenque Formation of Patagonia contains superbly preserved and diverse ichnofaunas, including the ichnogenera Asterosoma, Balanoglossites, Chondrites, Gastrochaenolites, Gyrolithes, Helicodromites, Macaronichnus, Nereites, Ophiomorpha, Palaeophycus, Phycosiphon, Planolites, Protovirgularia, Rhizocorallium, Rosselia, Schaubcylindrichnus, Scolicia, Siphonichnus, Skolithos, Spongeliomorpha, Taenidium, Teichichnus, and Thalassinoides. Wave-influenced open-marine deposits are characterized by intense bioturbation, complex tiering structures and a very high diversity. Restricted, brackish-water, tide-dominated deposits display lesser degrees of bioturbation, less complex tiering structures and lower ichnodiversity. Both marginal- and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trace fossils; Miocene; Chenque Formation; Patagonia; Shallow marine.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000100007

Tooth Root Size, Chewing Muscle Leverage, and the Biology of Homunculus patagonicus (Primates) from the late early Miocene of Patagonia
Provedor de dados: 41
Autores: Perry,Jonathan M. G.; Kay,Richard F.; Vizcaíno,Sergio F.; Bargo,M. Susana.
Inferences about the diet of Miocene platyrrhine monkeys have relied upon the morphology of the molar teeth, specifically the crests on the molars. Using a library of Micro-CT images of a broad comparative sample of living platyrrhines (callitrichines, cebines, pitheciids and atelids), late early Miocene Homunculus, and the early Miocene Tremacebus and Dolichocebus, we extend these inferences by examining the surface areas of the tooth roots, anchor points for the periodontal ligaments. From muscle scars on the skull, we estimate the mechanical leverage of the chewing muscles at bite points from the canine to the last molar. Extant platyrrhines that gouge bark to obtain exudates do not have especially large canine roots or anterior premolar roots compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primates; Platyrrhini; Homunculus; Miocene; Teeth; Diet.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142010000300007

Patagonichnus: a new trace fossil from the Miocene of Patagonia. A probable fodinichnion of gregarious polychaetes
Provedor de dados: 41
Autores: Olivero,Eduardo B.; López Cabrera,María I.
Miocene tidal deposits from Las Grutas, Patagonia, Argentina, superbly preserve cylindrically laminated burrow systems including Asterosoma radiciforme von Otto and three compound ichnospecies of the newly proposed ichnogenus Patagonichnus ; P. calyciformis n. isp.; P. stratiformis n. isp.; and P . thalassiformis n. isp. Together with large, palmate burrows, probably produced by crustacean decapods, they are elite trace fossils. The Patagonichnus burrow systems consist of many distinctive concentrically laminated elementary components including: horizontal and vertical, conical and helicoidal bulbs and swellings; vertical shafts; straight and paired branches; and cone-in-cone structures. Hollow, branched, straight or helicoidal inner lined tubes connect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trace fossils; Patagonichnus; Asterosoma; Miocene; Patagonia; Ethology; Polychaetes.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200002

Abundance and distribution of Lithophaga (Mytilidae) in extant and fossil oysters: taphonomic and paleobiological implications
Provedor de dados: 41
Autores: Mauna,Cecilia; Casadío,Silvio; Parras,Ana; Pascual,Marcela.
In this study we analyze the abundance and distribution patterns of Lithophaga patagonica in valves of Ostrea puelchana and compare them to those of Lithophaga sp. observed on the fossil species " Ostrea " patagonica and " Ostrea " alvarezii from the late Miocene Puerto Madryn Formation. No specimen of the fossil oysters showed borings of Lithophaga sp. on the interior surface of the valves. This suggests that they were produced while the oysters were still living and, at the same time, that the oyster beds were buried rapidly after death. In Ostrea puelchana the boring abundance was significantly higher for the left valve and, within it, the areas more heavily bored were the umbones and the platform. The same results were obtained for valves of " Ostrea "...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lithophaga; Bioerosion; Oysters; Taphonomy; Miocene; Argentina.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200010

A new Mammutidae (Proboscidea, Mammalia) from the Late Miocene of Gansu Province, China
Provedor de dados: 42
Autores: MOTHÉ,DIMILA; AVILLA,LEONARDO S.; ZHAO,DESI; XIE,GUANGPU; SUN,BOYANG.
ABSTRACT The "Yanghecun specimen", a proboscidean specimen represented by a mandible from Miocene of China and previously described as Gomphotheriidae, is here reviewed and described as a new genus and species of Mammutidae: Sinomammut tobieni. This taxon is a longirostrine mastodon, lacking lower tusks, and bearing a wide last molar with oblique and non-inflated lophids, broad transverse interlophids, and yoke-like wear figures. Phylogenetic analysis of Mammutidae based on dental and mandibular features recovered S. tobieni as sister group of the mastodon Mammut. The longirostrine condition and the well-developed lower incisors seem to be primitive for Mammutidae, while the brevirostry is the derived condition, probably emerged during the middle Miocene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evolution; Longirostrine symphysis; Mammutidae; Miocene; Proboscidea.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100065

Marine influence in the Barreiras Formation, State of Alagoas, northeastern Brazil
Provedor de dados: 42
Autores: Rossetti,Dilce F.; Góes,Ana M.
Tidal processes were important for deposition of the Barreiras Formation located in northern Brazil, while correlatable deposits in northeastern Brazil have been traditionally related to continental environments. Facies analysis in southern Alagoas revealed that the Barreiras Formation consists of cross-stratified conglomerates and sandstones (facies Sx and Cgx), compound cross-stratified sandstones (facies Cx), and heterolithic beddings (facies H). A significant portion of these deposits occurs within channel morphologies displaying fining and thinning upward successions. An abundance of sedimentary features is comparable to those from the northern Brazilian counterpart. These include: tidal bundles; herringbone cross-stratification; heterolithic beddings...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Miocene; Marine transgression; Tidal currents; Sedimentary structures; Northeastern Brazil.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400012

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