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Registros recuperados: 23
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A reevaluation of the late quaternary sedimentation in todos os Santos Bay (BA), Brazil Anais da ABC (AABC)
LESSA,GUILHERME C.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO; DOMINGUEZ,JOSÉ M. L..
Todos os Santos Bay is a large (<img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0052img1.gif" ALT="$ \approx$"> 1000 km²), structurally controlled tidal bay in northeast Brazil. Three main drainage basins debouch into the bay, providing a mean freshwater discharge of 200 m³/s (prior to 1985), or less than 1% of the spring tidal discharge through the bay mouth. Based on the result of several sedimentological studies performed in the 1970's, five surface sedimentary facies were identified inside the bay, namely i) transgressive siliciclastic marine sand facies; ii) transgressive bay sand-mud facies; iii) a transgressive carbonate marine sand facies; iv) regressive bay-mud facies, and v) regressive fluvial sand facies. The spatial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Estuary; Sediment; Stratigraphy; Holocene.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400008
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Características estratigráficas y morfodinámicas de la franja litoral Caribe colombiana (Sector Barranquilla (Bocas de Ceniza) - Flecha de Galerazamba) OceanDocs
Molina-M., A.; Molina-M., C.; Giraldo-O., L.; Barrera-O., R..
The geologic (stratigraphic) and morphodynamic characteristics throughout 76 km of the coastal profile of the Colombian Caribbean, including those between Barranquilla (Bocas de Ceniza) and the spit of Galerazamba are described. The sections of the coast that have been affected by erosive events and those with sedimentary accretion are described. Some of them are associated to both natural and anthropic phenomena. Geologically, the coastal edge is defined by sedimentary rocks, weakly consolidated sediments and inconsolidated sediments, that include ages from the upper Paleocene to the Recent. From the point of view of the evaluation of the coast in terms of stability and instability, the high coasts are classified as: Critic zones (Punta Sabanilla,...
Tipo: Journal Contribution Palavras-chave: Stratigraphy; Coastal zone; Erosion; Sedimentation; Stratigraphy; Erosion; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_7440; Http://aims.fao.org/aos/agrovoc/c_2651; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 1999 URL: http://hdl.handle.net/1834/3433
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Evolution of the danube deep-sea fan since the last glacial maximum: New insights into Black Sea water-level fluctuations ArchiMer
Constantinescu, Adriana; Toucanne, Samuel; Dennielou, Bernard; Jorry, Stephan; Mulder, T.; Lericolais, Gilles.
The Danube Deep-Sea Fan (NW Black Sea) is one of the most developed deep-sea sediment depositional systems in Europe. Although the morphology and the architecture have been widely described in the past years, little is known about the stratigraphy of this depositional system. For the late Quaternary, this results from the lack of significant stratigraphic markers, the scarcity of radiocarbon ages and the difficulty in constraining reservoir ages. Recent robust quantification of reservoir ages has allowed the construction of a new stratigraphic framework for the Black Sea from the end of the last glacial period to the Holocene, thus giving the opportunity to correlate sedimentological and geochemical features previously described on the NW Black Sea margin...
Tipo: Text Palavras-chave: Danube deep-sea fan; Turbidites; Stratigraphy; Last glacial maximum; Termination 1; Water-level fluctuations.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00271/38236/64238.pdf
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Geophysical characterization of bottom simulating reflectors in the Fairway Basin (off New Caledonia, Southwest Pacific), based on high resolution seismic profiles and heat flow data ArchiMer
Nouze, Herve; Cosquer, Emmanuel; Collot, Julien; Foucher, Jean-paul; Klingelhoefer, Frauke; Lafoy, Yves; Geli, Louis.
High-resolution reflection and refraction seismic data were collected in 2004 to investigate, in further detail than allowed by pre-existing low resolution seismic data, the nature of a Bottom Simulating Reflector (BSR) that extends over a broad area of the Fairway Basin, a rifted, continental structure located on the eastern flank of the Lord Howe Rise, to the southwest of New Caledonia. Two main reflectors are documented: the shallower (RN) mimics the seafloor and has a negative polarity while the deeper (RP) does not always mimic the seafloor and has a positive polarity. Using the existing regional seismic lines, we can show that reflector RN can be continuously followed up to DSDP 208 drill hole site. Reflector RP is discontinuous and cannot be traced...
Tipo: Text Palavras-chave: Stratigraphy; Gas hydrates; Geophysics; Southwest Pacific; Fairway Basin; BSR.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7321.pdf
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Holocene biostratigraphy and paleoenvironmental changes in the Black Sea based on calcareous nannoplankton ArchiMer
Giunta, Simona; Morigi, Caterina; Negri, Alessandra; Guichard, Francois; Lericolais, Gilles.
In this study, detailed micropaleontological analyses were carried out on 270 samples from eight piston cores collected in the Black Sea. The primary goal was to elucidate the Late Quaternary evolution of the Black Sea, specifically to refine its biostratigraphy and to explore the Holocene paleoenvironmental changes. Three intervals were recognized in all the cores studied, irrespective of whether they were from the basin or the shelf. These intervals are characterized, from old to young, by the spotty occurrence, the presence and the local acme of Emiliania huxleyi respectively. Moreover, the species Braarudosphaera bigelowii is, in contrast to the younger units, absent in the oldest unit. The co-occurrence of the two marine species E. huxleyi and B....
Tipo: Text Palavras-chave: Stratigraphy; Late Quaternary; Black Sea; Calcareous nannoplankton.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2674.pdf
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La Isla Santa Clara, testigo morfoestructural de la evolución geodinámica plio-cuaternaria y actual del Golfo de Guayaquil. OceanDocs
Santana, E.; Dumont, J.F..
Este contexto estratigráfico y estructural, hace que la Isla Santa Clara sea un testigo directo de los eventos neotectónicos del Golfo de Guayaquil. El estudio realizado en la Isla Santa Clara se ha desarrollado bajo dos objetivos: 1. Obtener datos detallados de la evolución temprana y actual de la Isla, en base a nuevos datos de estratigrafía y morfología, 2. Encuadrar la evolución de la Isla dentro del contexto sismotectónico y estructural del Golfo de Guayaquil, a fin de precisar la localización de las fallas potencialmente activas.
Tipo: Journal Contribution Palavras-chave: Stratigraphy; Structural geology; Tectonophysics; Quaternary; Bathymetric data; Oceanic islands; Stratigraphy; Http://aims.fao.org/aos/agrovoc/c_7440.
Ano: 2000 URL: http://hdl.handle.net/1834/2259
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Landscape evolution and depositional processes in the Miocene Amazonian Pebas lake/wetland system: evidence from exploratory boreholes in northeastern Peru. Naturalis
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
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Late Cretaceous-Early Palaeogene echinoderms and the K/T boundary in the southeast Netherlands and northeast Belgium — Naturalis
Jagt, J.W.M.; Kutscher, M..
The present paper is divided into two parts. In the first, all Campanian, Maastrichtian and Danian ophiuroids known to date from the extended type area of the Maastrichtian Stage, are described and illustrated. The geographic and stratigraphic distribution of this diverse echinoderm group are documented. A total of twenty-one genera (one of them new) and thirty-seven species (seven of them new) are recorded from the Campanian-Danian of Liège-Limburg and the Aachen area (Germany). The following taxa are new: Ophiocten? yvonnae sp. nov., Stegophiura? trispinosa sp. nov., Deckersamphiura inusitata gen. et sp. nov., Ophiarachna? martinblomi sp. nov., Ophiolepis? falsa sp. nov., Ophiomusium lux sp. nov., and Mesophiomusium decipiens gen. et sp. nov. Additional...
Tipo: Article / Letter to the editor Palavras-chave: Echinodermata; Ophiuroidea; Late Cretaceous; Early Palaeogene; Taxonomy; Stratigraphy; 42.72; 38.22.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/219095
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Late Cretaceous-Early Palaeogene echinoderms and the K/T boundary in the southeast Netherlands and northeast Belgium - Part 1: Introduction and stratigraphy Naturalis
Jagt, J.W.M..
In a series of papers describing Late Cretaceous and Early Palaeogene echinoderm faunas (exclusiveof holothurians) of the Maastrichtian type area, the present contribution comprises a detailed accountof the litho- and chronostratigraphy and biozonations of these deposits, and of localities from whichthe echinoderm material to be described stems. In subsequent papers reference will be made to thisintroductory part.
Tipo: Article / Letter to the editor Palavras-chave: Echinodermata; Late Cretaceous; Early Palaeogene; Localities; Stratigraphy; 42.77; 38.22.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/218995
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Late Cretaceous-Early Palaeogene echinoderms and the K/T boundary in the southeast Netherlands and northeast Belgium — Part 4: Echinoids Naturalis
Jagt, J.W.M..
All Campanian, Maastrichtian and Danian echinoids known to date from the extended type area of the Maastrichtian Stage are listed and, with a few exceptions, also illustrated. The geographic and stratigraphic distribution of these echinoderms are documented. A total of 55 (sub)genera and 119 (sub)species (inclusive of formae), two of which are new, are recognised. A number of taxa are reassigned, while others have to remain in open nomenclature for the time being. Recorded for the first time from the area are representatives of Hagenowia and Zeuglopleurus, as well as juvenile specimens of Hemipneustes striatoradiatus. Cidaris gigas (= Temnocidaris (Stereocidaris) gigas) is accepted as a valid species. The name Cyphosoma rutoti is shown to be based on the...
Tipo: Article / Letter to the editor Palavras-chave: Echinodermata; Echinoidea; Late Cretaceous; Early Palaeogene; Taxonomy; Stratigraphy; 42.72; 38.22.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/219114
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Late Cretaceous-Early Palaeogene echinoderms and the K/T boundary in the southeast Netherlands and northeast Belgium — Part 5: Asteroids Naturalis
Jagt, J.W.M..
All Campanian, Maastrichtian and Danian asteroids known to date from the extended type area of the Maastrichtian Stage, are described and illustrated. The geographic and stratigraphic distribution are documented. Eighteen genera (one of them new) and at least sixty-four species (eight of them new) are listed: Astropecten? sp. nov., astropectinid sp. nov., Coulonia? sp. nov., Lophidiaster? gr. punctatus/ postornatus, L. pygmaeus Spencer, 1913, Aldebarania sp. nov., Astropectinidae indet., ctenodiscid? indet., benthopectinid sp. 1 (? spp.), benthopectinid sp. 2, Metopaster alexiae sp. nov., M. aff. carinatus Brünnich Nielsen, 1943, M. continuus sp. nov., M. decipiens Spencer, 1913, M. kagstrupensis Brünnich Nielsen, 1943, M. lisannae sp. nov., M. miriamae...
Tipo: Article / Letter to the editor Palavras-chave: Echinodermata; Asteroidea; Late Cretaceous; Early Palaeogene; Taxonomy; Stratigraphy; 42.72; 38.22.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/219134
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Late Cretaceous-Early Palaeogene echinoderms and the K/Tboundary in the southeast Netherlands and northeast Belgium - Part 2: Crinoids Naturalis
Jagt, J.W.M..
All Campanian, Maastrichtian and Danian articulate (cladid) crinoids known to date from the extendedtype area of the Maastrichtian Stage, are described and illustrated. The geographic and stratigraphicdistribution of this unexpectedly diverse echinoderm group are documented. A total of twentygenera (three of them new) and thirty-six species (six of them new) are defined: Austinocrinus bicoronatus(von Hagenow, 1840), ‘Isocrinus’ sp., ‘I.’ lanceolatus (Roemer, 1840)?, Isselicrinus buchii (Roemer,1840), Praeisselicrinus? limburgicus (Rasmussen, 1961), Nielsenicrinus agassizii (von Hagenow, 1840) (=‘Pentacrinites’ kloedeni von Hagenow, 1840), N. ewaldi sp. nov., Jaekelometra gr. belgica (Jaekel, 1902), J.gr. concava (Schlüter, 1878) (= J. columnaris Gislén,...
Tipo: Article / Letter to the editor Palavras-chave: Echinodermata; Crinoidea; Late Cretaceous; Early Palaeogene; Taxonomy; Stratigraphy; 42.77; 38.22.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/218997
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New data on Early Cretaceous (Hauterivian-Barremian) heteromorphic ammonites from northern Germany Naturalis
Kakabadze, M.V.; Hoedemaeker, P.J..
The stratigraphic ranges and systematics of heteromorphic ammonites from Lower Cretaceous (Hauterivian-Barremian) deposits in Lower Saxony, northern Germany, are revised. Nine genera and fortyseven species of the family Ancyloceratidae Gill, 1871, are described. One genus (Fissicostaticeras) and 20 species are new; Emericiceras ressense, E. sornayiforme, E. serpentinum, E. subtilicostatum, E. gotti, E. hannoverense, E. kemperi, Crioceratites hastensis, C. subisocostatus, C. vermiformis, Fissicostaticeras claviferum, F. aequicostatoides, F. rarocinctoides, Paracrioceras kleini, Acrioceras (Acrioceras) sarstedtense, A. (A.) crassicostatum, A. (A.) aegidii, A. (A.) longum, A. (A.) astrictum and Uhligia aegidii.
Tipo: Article / Letter to the editor Palavras-chave: Heteromorphic ammonites; Systematics; Hauterivian; Barremian; Stratigraphy; Northern Germany; New taxa; 38.22.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/329769
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Notas preliminares sobre la estratigrafía del Paleozoico en el Norte de los Andes de Colombia. OceanDocs
Forero, A..
Se describen los afloramientos paleozoicos en el flanco occidental de la Serranía de Perijá y los recientemente descubiertos en el flanco oriental de la Sierra Nevada de Santa Marta del Devoniano y Carboniano superior, a la vez que se intenta una correlación de los mismos afloramientos con los ya conocidos en el flanco oriental de la Serranía de Perijá y Serranía de Mérida. Al este de Manaure la serie paleozoica está representada por rocas metamórficas del Cambro-Ordoviciano y capas no metamórficas del Devoniano, Carboniano y Permiano.
Tipo: Journal Contribution Palavras-chave: Stratigraphy; Stratigraphy; Http://aims.fao.org/aos/agrovoc/c_7440.
Ano: 1967 URL: http://hdl.handle.net/1834/3260
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On the Barremian - lower Albian stratigraphy of Colombia Naturalis
Hoedemaeker, P.J..
The biostratigraphy and sequence stratigraphy of the Barremian deposits, and the biostratigraphy of the Aptian deposits in the Villa de Leyva area in Colombia are briefly described.
Tipo: Article / Letter to the editor Palavras-chave: Stratigraphy; Barremian; Aptian; Depositional sequences; Colombia; 38.16.
Ano: 2004 URL: http://www.repository.naturalis.nl/record/214456
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Stratigraphic framework of early Pliocene fossil localities along the north bank of the Cimarron River, Meade County, Kansas Ameghiniana
Honey,James G.; Peláez-Campomanes,Pablo; Martin,Robert A..
The stratigraphy of early Pliocene (early Blancan) fossiliferous sediments exposed in canyons along the north bank of the Cimarron River in Meade County, Kansas is described as part of a larger, ongoing project to create a refined biostratigraphic model for late Neogene and Pleistocene mammalian fossil localities from the Meade Basin. Because the utility of previously named formation and member names is questionable, we introduce a set of informal names for stratigraphic units in our study area. Sediments in the region are up to 34 m thick, and include a basal sand and gravel ("Bishop gravel") at least 9 m thick, overlain by up to 17 m of lightto pinkish-gray, fine-grained sand and silt, with interbedded calcium carbonate layers. These fine-grained...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mammals; Rodents; Pliocene; Blancan; Stratigraphy.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200015
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Stratigraphy and sedimentary environments during the Late Quaternary, in the Eastern Bohai Sea (North China Platform) ArchiMer
Marsset, Tania; Xia, D; Berne, Serge; Liu, Z; Bourillet, Jean-francois; Wang, K.
The Bohai Sea is a shallow sea at the east coast of China. It communicates with the Yellow Sea through a narrow strait. During and since the Late Pleistocene, the Bohai Sea has been a filled subsiding basin submitted to successive regressive-transgressive cycles. In the East Bohai Sea, a number of finger-shaped ridges are present near the strait, where tidal currents are dominant. Very-high resolution seismic reflection data have been interpreted relative to sedimentological data provided by a formerly drilled borehole. Seven seismic units are identified and correlated with the following events: units U7-U6 with the Bohai relative sea level rise (65,000–53,000 yr B.P.) and a relative sea level fall (53,000–39,000 yr B.P.); unit U5 with the Xianxian...
Tipo: Text Palavras-chave: Eastern Bohai Sea; Late Pleistocene; Stratigraphy; Relative sea level variations; Tidal ridges; Very-high resolution seismic.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00061/17193/14695.pdf
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Stratigraphy of the type Maastrichtian – a synthesis Naturalis
Jagt, J.W.M.; Jagt-Yazykova, E.A..
A synthesis of the stratigraphy of the Maastrichtian Stage in its extended type area, that is, southern Limburg (the Netherlands), and adjacent Belgian and German territories, is presented with a brief historical overview. Quarrying activities at the large quarry complex of ENCI-HeidelbergCement Group will officially come to an end on July 1, 2018. However, the stratotype section below the Lichtenberg farmstead and directly behind the main office building at the Lage Kanaaldijk (Maastricht), will be preserved, as will various faces within the quarry complex. Strata of Maastrichtian age include the Vijlen, Lixhe 1-3 and Lanaye members of the Gulpen Formation, as well as the Valkenburg, Gronsveld, Schiepersberg, Emael, Nekum and Meerssen members of the...
Tipo: Article / Letter to the editor Palavras-chave: Late Cretaceous; Maastrichtian; Type area; Localities; Stratigraphy; 38.16; 38.22.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/428924
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Subseafloor stratigraphic profiling and soil classification from piezocone tests: A case study in the Gulf of Lion (NW Mediterranean Sea) ArchiMer
Lafuerza, S.; Frigola, J.; Canals, M.; Jouet, Gwenael; Bassetti, Maria-angela; Sultan, Nabil; Berne, Serge.
We show the results provided by piezocone tests in determining the stratigraphic profile and the soil classification of two drilling sites in the outer shelf and the upper slope of the Gulf of Lion, PRGL2 and PRGL1, respectively. Correlations with grain-size data indicate that sleeve friction can be used for profiling fine-grained sediments (site PRGL1), whereas cone tip resistance is the most adequate for sequences made of alternations of coarse- and fine-grained intervals (site PRGL2). Normalized cone resistance and friction ratio proved to be also appropriate for soil stratigraphy as it depicts trends in the coarse fraction of the tested soil. Silts and clays present in similar proportions at site PRGL1 responded to piezocone testing as pure clays...
Tipo: Text Palavras-chave: Gulf of Lion; Soil classification; Stratigraphy; Piezocone.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6121.pdf
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The eolianites between Sanga do Cabral and Botucatu formations in Rio Grande do Sul State, Brazil Anais da ABC (AABC)
NOWATZKI,CARLOS H.; KERN,HENRIQUE P..
This paper discusses the facies distribution of Mesozoic eolian sandstones between the Sanga do Cabral and Botucatu formations and also their contact relationships, in São Leopoldo area, State of Rio Grande do Sul (RS), southern Brazil. The main distinctive characteristics regarding these sandstones and formations are the mineralogical composition, paleocurrents and the occurrence of wet interdune deposits. These interdune deposits are characterized by frequent thin mudstone layers with mudcracks, ichnofossils and salt impressions. There are also some features that resemble plant fossils. The distinctive characteristics of these sequences to Sanga do Cabral and Botucatu formations allow us to suggest the informal name of Pedreira Sandstone, considering its...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stratigraphy; Paraná Basin; Mesozoic; Faciology; Paleoenvironments.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200010
Registros recuperados: 23
Primeira ... 12 ... Última
 

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