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| http://dx.doi.org/10.1073/pnas.18.8.550 | DOI Listing |
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Maxilla of Siamopithecus eocaenus (Anthropoidea, Primates) from the Paleogene of Krabi, Thailand, and its taxonomic status.
J Hum Evol
January 2025
Laboratory Paleontology, Evolution, Paleoecosystems and Paleoprimatology (PALEVOPRIM), UMR 7262 CNRS, University of Poitiers, France.
Detailed descriptions of the maxillae of Siamopithecus eocaenus, discovered from the latest Eocene/earliest Oligocene lignite mine in the Krabi basin of Peninsular Thailand, are presented. They include the morphology of P-M, the palate, a partial orbital region, and the zygomatic root. The specimen exhibits distinctive dental features including a single-rooted P alveolus, a protocone on the P and P, and a true hypocone on the upper molars, indicating its derived anthropoid dentition.
View Article and Find Full Text PDFFirst records of two mackerel shark species ( comb. nov. and ; Lamnidae) from New Zealand.
J R Soc N Z
December 2023
Palmetto Paleontology Foundation, Summerville, USA.
Article Synopsis
- - The genus Lamnidae, known for species like the modern white shark, has a fossil record dating back to the late Oligocene and is found globally, with many extinct species recognized from the Cenozoic era.
- - This text reports the first occurrences of two extinct species of Lamnidae in New Zealand, specifically on the South Island.
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A new genus and species of kekenodontid from the late Oligocene of New Zealand with comments on the evolution of tooth displacement in Cetacea.
J R Soc N Z
January 2024
Department of Geology, University of Otago, Dunedin, New Zealand.
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- The Kekenodontidae are a group of late-surviving prehistoric whales known as archaeocetes from the Late Oligocene period found in the Southwest Pacific, including a newly identified species from New Zealand.
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Pore Classification and Structural Characteristics of Oligocene-Pliocene Shale Reservoirs in the Western Qaidam Depression.
ACS Omega
June 2024
Hubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environment, Yangtze University, Wuhan 430100, China.
Oligocene-Pliocene shale reservoirs in the Western Qaidam Depression represent typical mixed shale deposits characterized by moderate organic matter (OM) abundance and sufficient OM maturity, indicating substantial shale-oil resource potential. Here, a comprehensive study was conducted to analyze the reservoir characteristics of different shale types, including the Upper Xiaganchaigou (late Oligocene), Shangganchaigou (Miocene), and Xiayoushashan (early Pliocene) Formations in the Western Qaidam Depression. Our analysis focused on the pore structural characteristics of shale reservoirs, employing X-ray diffraction, casting thin sections, scanning electron microscopy, low-temperature nitrogen adsorption, and nuclear magnetic resonance (NMR) as investigative techniques.
View Article and Find Full Text PDFAccumulation and Quantitative Assessment of Terrigenous Organic Matter in Upper Oligocene to Lower Miocene Marine Source Rocks of the Qiongdongnan Basin.
ACS Omega
May 2024
School of Energy Resources, China University of Geosciences, Beijing 100083, China.
The intense collision between marine and terrestrial agents results in the dual-source (marine and terrigenous) characteristics of marine source rocks. Our research quantitatively assessed terrestrial organic matter and revealed the crucial role of terrestrial organic materials in the organic matter enrichment of lower Miocene to upper Oligocene marine source rocks in the Qiongdognnan Basin. The quantitative assessment was achieved using partial least-squares analysis with eight biomarker parameters associated with -alkanes, isoprenoids, bicadinanes, taraxerane, tricyclic terpanes, and gammacerane.
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