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Showing 1 to 18 of 18 for “"Pliocene–Pleistocene"”.
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Pliocene-Pleistocene Radiolarian Investigations of the Equatorial Oceans
… a detailed palaeoenvironmental study of the Plio-Pleistocene Olduvai magnetosubchron (1.95-1.79Ma) of the equatorial Indo-Pacific Oceans. A number of radiolarian tools are used as palaeoceanographic proxies, including the recognition of distinct glacial and interglacial assemblages, which form the …
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Lithofacies of the Pliocene-Pleistocene Lucayan Limestone, Great Abaco Island, Little Bahama Bank
<p>Petrographic and sedimentologic analyses of eleven shallow subsurface cores (3 to 19 meters in length) from the Lucayan Limestone where it occurs along northeastern Great Abaco Island (little Bahama Bank) are used to delineate five carbonate lithofacies. The most prevalent lithofacies is a …
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Pliocene-Pleistocene landscape evolution in south-central Chile : interactions between tectonic, geomorphic, and climatic processes
… sedimentology, and morphometry to quantify the Pliocene-Pleistocene landscape evolution of the tectonically active south-central Chile forearc. Thereby, I provide (1) new results about the influence of seismotectonic forearc segmentation on the geomorphic evolution and (2) new insights in the …
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Dinoflagellate cyst record and paleoceanography through the Pliocene–Pleistocene transition at ODP Site 1143, southern South China Sea
… Sea, spanning a 2.90–2.41 Ma interval across the Pliocene–Pleistocene boundary, reveals a well preserved and relatively diverse dinoflagellate cyst (dinocyst) record. Generally, the cysts of phototrophic (gonyaulacoid) taxa increased during interglacials whereas those of heterotrophic …
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Paleoceanography across the Pliocene–Pleistocene transition in the southern Bering Sea: dinoflagellate cysts and acritarchs from IODP Site U1341
The latest Pliocene–earliest Pleistocene (2.828 Ma to 2.401 Ma) interval from Integrated Ocean Drilling Program Site U1341, Bowers Ridge, southern Bering Sea, northern North Pacific has been analyzed for dinoflagellate cysts, acritarchs and other palynomorphs. Based on 86 samples, with a spacing …
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Geology of the Tierras Blancas Area in the Southeastern Acambay Graben, Central Mexico
<p>Pliocene-Pleistocene sediments in the southeastern Acambay graben, central Mexico have yielded mammal fossils, including <em>Equus simplicidens</em>, cf. <em>Rhynchotherium</em>, ?<em>Camelops</em>, <em>Mammuthus</em> sp., <em>Bison</em> sp., and <em>Antilocapra</em> sp. The fossiliferous …
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Seasonal rainfall regime modulates genetic variation in the moss Pseudocrossidium crinitum
Patterns of genetic variation, resulting from Pliocene-Pleistocene climate shifts have been largely documented for species from Europe. However, little is known from Africa and especially South Africa, where climate shifts have often been invoked to explain the amazingly high diversity of the Cape …
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Climatic and tectonic controls on deep water sedimentary cyclicity : evidence from the Miocene to Pleistocene of Cyprus
… Cyprus has extensive outcrops of Miocene to Pleistocene deep water sediments and provides an ideal setting to test the magnitude of climatic signals in tectonically active areas, and thus deduce the relative roles of climate and tectonics on sedimentation.<br></br><br></br>Detailed …
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REVISED STRATIGRAPHIC AND TECTONIC EVOLUTION OF THE SAN FRANCISCO RIDGE; AN EMERGING PUSH-UP STRUCTURE IN THE NORTHEAST DOMINICAN REPUBLIC
… Miocene age and polymictic conglomerates with Pliocene-Pleistocene age that unconformably overlie the older and fined grained sedimentary units. The conglomerates are located in elevated areas of the San Francisco Ridge, especially in the northeast and northwest regions. The conglomerates have …
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Anomalous carbonate preservation in the abyssal North Pacific, ODP sites 882 and 1179: planktonic foraminiferal analysis, climate change and palaeogeomagnetism /
… ~250m and ~ 1.5km respectively, these late Pliocene-Pleistocene cores contained large quantities of carbonate, a small proportion of which is composed of well-preserved foraminiferal tests with minor to no signs of dissolution. This excellent preservation is unusual in light of their …
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Tectonostratigraphic evolution of the Sinu accretionary prism and Lower Magdalena forearc basin formed above a shallow-dipping subduction zone, Caribbean margin of Colombia
… Panama arc. In the accretionary prism, Pliocene-Pleistocene deformation developed on an imbricated backward breaking imbricated fan of thrust faults with out-of-sequence thrust faulting (OOST) within inner and outer parts of the prism. Inactive strike-slip faults were identified in a …
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Pollen and grain size records in abyssal sediments of the northwest Pacific Ocean as proxies of Plio-Pleistocene climate change /
… to climate change in East Asia since the mid-Pliocene. Dust-sized particles (including pollen), sourced from the arid regions and loess plateaus in East Asia are entrained by prevailing westerly winds and transported to the midlatitude northwest North Pacific Ocean. This is recorded by peaks …
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Characteristics and evolution of a dynamic prograding continental margin: the late Neogene Giant Foresets Formation, northern Taranaki Basin, New Zealand
The Pliocene-Pleistocene Giant Foresets Formation represents the progradation and development of the modem continental margin in northern Taranaki Basin. The dynamic evolution of this formation is fundamentally linked to a Pliocene-Pleistocene increase in sediment flux sourced from South Island, to …
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Cenozoic geology of the continental slope and rise off western Nova Scotia
… Paleocene, Eocene-Oligocene, and Pleistocene. Extensions of Tertiary canyons onto the slope are poorly defined, but small Paleocene fans of interbedded chalk and mudstone on the upper rise indicate that slope canyons existed at that time. Abyssal currents eroded the upper rise and …
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Newly discovered fossils provide novel insights on Cenozoic neotropical snakes
Las serpientes son un grupo de reptiles escamados con una enorme diversidad en el Neotrópico. Sin embargo, el registro fósil de estos vertebrados es escaso en el norte de Sur América. Aquí describo algunos fósiles de serpientes de tres diferentes localidades de Colombia. Primero, del Mioceno del …
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Smectite/Illite Distribution and Diagenesis in the South Timbalier Area, Northern Gulf of Mexico
… paleontological markers identifying the Miocene, Pliocene, and Pleistocene boundaries. Bulk mineralogy of each sample, determined by XRD, is primarily mixed-layer smectite and illite with a minor amount of kaolinite. The mixed-layer mineralogies are end-member smectite, mixed-layer smectite, …
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High-latitude sedimentation in response to climate variability during the Cenozoic
… Our primary study spans from the Late Pliocene to the Pleistocene (3.3 to 0.7 Ma), and features results from two International Ocean Discovery Program (IODP) Sites U1525 and U1524. Each of these sites is discussed in separate chapters here (Chapters 1 and 2). This interval experienced …
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Analysis of the central Hawke's Bay sector of the Late Neogene forearc basin, Hikurangi margin, New Zealand
… as part of an analysis of the Late Miocene-Early Pleistocene basin fill. A substantially revised lithostratigraphic nomenclature is proposed for the Neogene succession, particularly for the latest Miocene-Early Pleistocene part (Mangaheia Group). The Tolaga Group is extended into central Hawke's …