نتایج جستجو برای: biozone

تعداد نتایج: 108  

Journal: :Iraqi journal of science 2021

The Yamama Formation was studied in three wells (Fh-1, Fh-2, and Fh-3) within Faihaa oil field, south Iraq. Thin sections were by using the polarizing microscope examination order to determine microfossils biozone. Thirty-five species of benthic foraminifera recognized, including four index species. In addition, twelve calcareous green algae two Other fossils that recognized include Gastropoda,...

2017
Mathias Harzhauser Gudrun Daxner-Höck Margarita A. Erbajeva Paloma López-Guerrero Olivier Maridet Adriana Oliver Werner E. Piller Ursula B. Göhlich Reinhard Ziegler

The Taatsiin Gol Basin in Mongolia is a key area for understanding the evolution and dispersal of Central Asian mammal faunas during the Oligocene and early Miocene. After two decades of intense fieldwork, the area is extraordinarily well sampled and taxonomically well studied, yielding a large dataset of 19,042 specimens from 60 samples. The specimens represent 176 species-level and 99 genus-l...

Journal: :Quaternary International 2022

The Chinese open-air site Xuchang-Lingjing (Henan) is located near the border between Palearctic and Oriental biozone in a lowland depression at southern edge of North China Plain. yielded Middle Palaeolithic assemblage that includes two fragmented, incomplete human (possibly Denisovan) skulls (Xuchang 1 Xuchang 2), more than 15,000 artefacts 40,000 mammalian remains representing least 20 taxa....

Journal: :Comptes Rendus Palevol 2021

Most upper Homerian and Ludfordian retiolitines have a tubarium with hexagonal meshes zigzag pattern in the middle part of their lateral walls, shallow ancora umbrella, free nema. Hoffmanigraptus varsoviensis n. gen., sp. is described from isolated, three-dimensional material, Colonograptus praedeubeli Biozone (upper Homerian, Silurian) Poland, Baltica, represents one earliest forms this constr...

Journal: :Paleontological Research 2021

Two new graptolite assemblages are identified from discrete intervals within the Phu Ngu Formation, Na Ri District, Bac Kan Province, north-east Vietnam. The graptolites occur in laminated mud/siltstones thought to be distal turbidite deposits. A low-diversity diplograptid sensu lato assemblage occurs mud-rich layers that interlaminated with silty and sandy horizons containing dendroid Dictyone...

2006
Bridget S. Wade William A. Berggren Richard K. Olsson

Planktonic foraminifera from a continuous Oligocene succession with clear magnetochronology and sediment cycles at Ocean Drilling Program Site 1218 (equatorial Pacific Ocean) were studied in the interval from 27 to 30 Ma. Paragloborotalia taxa are common and we examined their size, relative abundance, and stable isotopes. Multispecies stable isotope data indicate the depth habitats of Oligocene...

Journal: :Iraqi geological journal 2023

The rock successions of the Chia Gara Formation were studied at two surface sections (Barsarin and Rania) from North-Eastern Iraq. detailed sedimentological study reveals that formation consists basically thin-bedded black limestone, dolomitic marly bituminous shales, Ammonitic limestone. petrography results showed various petrographic components as Ammonites, calcispheres, radiolarian, silicat...

2017
ROBERT A. GASTALDO JOHANN NEVELING CINDY V. LOOY MARION K. BAMFORD SANDRA L. KAMO JOHN W. GEISSMAN

Vertebrate paleontologists have proposed a model for the terrestrial end-Permian event in the Karoo Basin, South Africa. The scenario envisions vegetational collapse that resulted in a phased extinction of vertebrate taxa in the uppermost Daptocephalus Assemblage Zone and overlying Lystrosaurus Assemblage Zone. These biodiversity patterns are placed into composite stratigraphic sections at key ...

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