نتایج جستجو برای: lower paleocene
تعداد نتایج: 692817 فیلتر نتایج به سال:
Fideliacyclus wombatiensis gen. et sp. nov. – a Paleocene non-marine centric diatom from northern Canada with complex frustule architecture Peter A. Siver, Alexander P. Wolfe & Mark B. Edlund To cite this article: Peter A. Siver, Alexander P. Wolfe & Mark B. Edlund (2016): Fideliacyclus wombatiensis gen. et sp. nov. – a Paleocene non-marine centric diatom from northern Canada with complex frust...
Temperatures in tropical regions are estimated to have increased by 3° to 5°C, compared with Late Paleocene values, during the Paleocene-Eocene Thermal Maximum (PETM, 56.3 million years ago) event. We investigated the tropical forest response to this rapid warming by evaluating the palynological record of three stratigraphic sections in eastern Colombia and western Venezuela. We observed a rapi...
Abstract In Egypt, Wadi Qena Middle Eastern Desert, Paleogene successions exposed at Hawashiya and Abu Had sections from north to south were measured comprehensively investigated for their foraminiferal content. The Dakhla, Tarawan, Esna formations make up the sections. studied are subdivided into six biozones; they five zones of Late Paleocene ( Igorina albeari subzone (P3b), G. Globanomalina ...
Sedimentological studies of ancient fluvial systems commonly do not consider in detail palaeosols floodplain deposits. This is the case upper Paleocene Esplugafreda Formation (Pyrenees, Spain), a 100–340 m thick alluvial succession, which represent more than 80% its thickness. unit closely predates climate crisis Paleocene/Eocene transition, PETM (Paleocene/Eocene Thermal Maximum). The purpose ...
Earliest Paleocene Purgatorius often is regarded as the geologically oldest primate, but it has been known only from fossilized dentitions since it was first described half a century ago. The dentition of Purgatorius is more primitive than those of all known living and fossil primates, leading some researchers to suggest that it lies near the ancestry of all other primates; however, others have...
Dramatic warming and upheaval of the carbon system at the end of the Paleocene Epoch have been linked to massive dissociation of sedimentary methane hydrate. However, testing the Paleocene-Eocene thermal maximum hydrate dissociation hypothesis has been hindered by the inability of available proxy records to resolve the initial sequence of events. The cause of the Paleocene-Eocene thermal maximu...
The Paleocene-Eocene transition in North American land-mammal faunas is well documented on the south side of Polecat Bench and in surrounding badlands of northwestern Wyoming. Here a rich fossil record is known from a stratigraphic section with an established geomagnetic polarity time scale and mediumto high-resolution carbon and oxygen isotope records. The Paleocene-Eocene carbon isotope excur...
Upper abyssal to lower bathyal benthic foraminifera from Ocean Drilling Program Sites 689 (present water depth 2080m) and 690 (present water depth 29I4m) on Maud Rise (Antarctica) recorded changes in deep-water characteristics at high southern latitudes during the cenozoic. The benthic foraminiferal faunas show only minor differences as a result of the difference in water depths between the sit...
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