Results 11 to 20 of about 6,571 (197)

The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

open access: yesGeophysical Monograph Series, Page 229-246., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Alexander J. Dickson   +2 more
wiley  

+6 more sources

A new genus of chemosymbiotic vesicomyid bivalves from the Oligocene of western North America [PDF]

open access: yesActa Palaeontologica Polonica, 2022
We describe a new genus of the chemosymbiotic bivalve family Vesicomyidae, Squiresica, for two Oligocene species, previously assigned to Archivesica, from western North America.
FRIDA HYBERTSEN   +2 more
doaj   +1 more source

Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin

open access: yesShiyou shiyan dizhi, 2021
The H3 sand group of the upper section of the Oligocene Huagang Formation in the western sub-sag of the Xihu Sag of the East China Sea Continental Shelf Basin is a tight sandstone reservoir with low porosity and low or ultra-low permeability.
Mengtian GAO   +5 more
doaj   +1 more source

An Early Oligocene Fossil Lagerstätten from the Lacustrine Deposits of the Luberon UNESCO Global Geopark [PDF]

open access: yesGeoconservation Research, 2021
The Luberon early Oligocene fossil Lagerstätte yields exquisitely well-preserved fossils as testified by the remains of articulated skeletons, skin outlines, feathers and original pigmentation patterns.
Pauline Coster, Stephane Legal
doaj   +1 more source

Overturned Eocene – Lower Pliocene alluvial stratum on the southern coast of Lake Baikal and its neotectonic significance

open access: yesГеодинамика и тектонофизика, 2021
The study is focused on a section of sediments exposed on the right bank of Mishikha River, Russia. These sediments have a wide range of ages, from the Eocene to the Lower Pliocene.
A. Al Hamoud   +8 more
doaj   +1 more source

Oligocene Trace Fossil Geoconservation and Geoheritage: On the Mammals Tracks of the Luberon UNESCO Global Geopark [PDF]

open access: yesGeoconservation Research, 2021
Trace fossils represent an important component of the Earth’s heritage that provide important keys for learning about the diversity and evolution of life and environments through time.
Pauline Coster, Stephane Legal
doaj   +1 more source

Oligocene climate dynamics [PDF]

open access: yesPaleoceanography, 2004
A planktonic and benthic foraminiferal stable isotope stratigraphy of the Oligocene equatorial Pacific (Ocean Drilling Program, Site 1218) was generated at 6 kyr resolution between magnetochrons C9n and C11n.2n (∼26.4–30 Ma on a newly developed astronomically calibrated timescale).
Wade, B.S., Pälike, H.
openaire   +3 more sources

New material of Epiaceratherium and a new species of Mesaceratherium clear up the phylogeny of early Rhinocerotidae (Perissodactyla) [PDF]

open access: yesRoyal Society Open Science, 2020
Reduction of the anterior dentition (i.e. incisors and canines) is a major adaptative trait of the Rhinocerotidae among Perissodactyla. However, the corresponding evolutionary sequence was lacking a robust phylogenetic frame to support it thus far. Here,
Jérémy Tissier   +2 more
doaj   +1 more source

Paleoenvironmental features and ostracod investigation of Paleogene-Neogene sequences in Babaeski- Lüleburgaz- Muratlı-Çorlu region (Southeastern Thrace, Turkey)

open access: yesBulletin of the Mineral Research and Exploration, 2019
Aim of the study is to evaluate the Paleogene-Neogene sequences of Babaeski- Lüleburgaz- Muratlı-Çorlu (Southeastern Thrace, Turkey) region using the micropaleontological analysis on two borehole samples collected by Mineral Research and Exploration (MTA)
ÜMİT ŞAFAK
doaj   +1 more source

Paleovegetation and paleoclimate in the Baise Basin during Oligocene

open access: yes地质科技通报, 2022
To reconstruct the palaeovegetation and palaeoclimate in the Baise Basin during the Oligocene, in this work, we analyzed sporopollen fossils from the Fuping Formation in this region.
Yi Wei, Bing Yang, Huijuan Deng
doaj   +1 more source

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