Results 1 to 10 of about 61,318 (247)

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

Tuning the Charge Transfer and Optoelectronic Properties of 4,6-Di(Thiophene-2-Yl)Pyrimidine Via Oligocenothiophene Substitution [PDF]

open access: yesArchives of Metallurgy and Materials, 2018
Five new derivatives of 4,6-di(thiophen-2-yl)pyrimidine (DTP) were designed by structural modification with the aim to tune the electro-optical and charge transfer properties.
A. Irfan   +5 more
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

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

Taxonomy and biostratigraphy of new and emended species of Cenozoic deep-water agglutinated foraminifera from the Labrador and North Seas [PDF]

open access: yes, 1989
Deep marine, fine grained sedimentary strata of Maastrichtian through Miocene age in the Labrador and North Sea sedimentary basins are rich in agglutinated benthic foraminifera.
Gradstein, F. M., Kaminski, M. A.
core   +1 more source

Eocene–early Oligocene climate and vegetation change in southern China: Evidence from the Maoming Basin [PDF]

open access: yes, 2017
Although the Eocene-Oligocene climate transition marks a critical point in the development of the ‘icehouse’ global climate of the present little is known about this important change in the terrestrial realm at low latitudes.
Aleksandrova, Galina N.   +8 more
core   +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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