نتایج جستجو برای: paleocene

تعداد نتایج: 1189  

Journal: :Nature Communications 2021

Abstract The Paleocene–Eocene Thermal Maximum (PETM) was a period of geologically-rapid carbon release and global warming ~56 million years ago. Although modelling, outcrop proxy records suggest volcanic occurred, it has not yet been possible to identify the PETM trigger, or if multiple reservoirs were involved. Here we report elevated levels mercury relative organic carbon—a for volcanism—dire...

2003

Rosenfeld and Pindell (2002, 2003) hypothesized that the Gulf of Mexico evaporated to a level below the world ocean for a brief interval during the Paleocene-Eocene. Further study and the results of recent drilling support this idea and suggest that a major change in the interpretation of the Gulf’s history may be warranted. The idea originally arose to explain several major Paleocene-Eocene pa...

2005
GABRIEL J. BOWEN PAUL L. KOCH JIN MENG JIE YE SUYIN TING

The Asian continent preserves a rich and diverse record of Paleogene mammal faunas and their evolution through time. The sequence of faunal succession is of key importance to our understanding of the origin and diversification of modern mammal groups, as phylogenetic data suggest that many major modern clades may be rooted in Asia. By calibrating the Asian fauna sequence within a chronostratigr...

Journal: :Swiss Journal of Palaeontology 2023

Abstract From the upper Maastrichtian (Tarbur Fm.) and Paleocene of Iran, 20 species scleractinian corals belonging to 17 genera 14 families, one octocoral Heliopora are newly recorded. Furthermore, coral previously described from Tarbur Fm. revised included in evaluation, resulting a total 37 28 families (including 3 subfamilies) for Iranian K/Pg-boundary time period. The majority taxa (21 out...

Journal: Journal of Tethys 2017

Forty two Paleocene benthic foraminiferal species of the Midway Formation in the Gulf Coastal Plain of Texas, USA were firstly investigated by Plummer (1927), and its paleogeographic distribution in some other countries in the Tethyan province were recorded: North America (USA, Mexico), South America (Argentina), Europe (North Sea Basin, Spain, France, Italy, Czech Republic, Bulgaria), North Af...

Journal: :Journal of The National Science Foundation of Sri Lanka 2023

The Mannar Basin extends over 45,000 km2 off the western coast of Sri Lanka. It has evolved due to multiphase rifting between Indo-Lanka landmasses during Barremian-Paleocene time. sediment thickness basin ranges from about 4 10 km. northern part is a targeted area for hydrocarbon exploration in Though two natural gas discoveries were made 2011, remains frontier lack well penetration and 3D sei...

2011
KONSTANTIN R. TABACHNICK LARISA L. MENSHENINA

The genus Aspidoscopulia previously known from a single Recent representative from the Indonesian Archipelago has been found to have wide West Pacific distribution, being present in large numbers in French and Russian collections. Two new Recent species of this genus, i.e. A. bisymmetrica sp. n. and A. tetrasymmetrica sp. n., are here described and illustrated. The genus is also found to have f...

Journal: :Science 2005
Aradhna Tripati Henry Elderfield

A rapid increase in greenhouse gas levels is thought to have fueled global warming at the Paleocene-Eocene Thermal Maximum (PETM). Foraminiferal magnesium/calcium ratios indicate that bottom waters warmed by 4 degrees to 5 degrees C, similar to tropical and subtropical surface ocean waters, implying no amplification of warming in high-latitude regions of deep-water formation under ice-free cond...

2015
Yunfa Chen Steven R. Manchester William Oki Wong

Deviacer guangxiensis Chen & Manchester sp. nov. is described based on asymmetric samaras from the Oligocene Ningming Formation in Guangxi, South China, representing the first documentation of Deviacer fossils in Asia. The Oligocene species, with relatively large fruits, represents the youngest record of the genus so far known; all other records are from the Paleocene and Eocene, or late Eocene...

Journal: :Science 2002
Jonathan I Bloch Doug M Boyer

The evolutionary history that led to Eocene-and-later primates of modern aspect (Euprimates) has been uncertain. We describe a skeleton of Paleocene plesiadapiform Carpolestes simpsoni that includes most of the skull and many postcranial bones. Phylogenetic analyses indicate that Carpolestidae are closely related to Euprimates. C. simpsoni had long fingers and an opposable hallux with a nail. I...

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