نتایج جستجو برای: early permian
تعداد نتایج: 688457 فیلتر نتایج به سال:
Abstract New fossil insect specimens from two new localities in Germany, namely Sperbersbach and Cabarz (Goldlauter Formation; early Permian), belonging to the Grylloblattida, are described. Abundant material is assigned Pictoborella clara n. gen. sp., regarded as closely related germanica (Prokop et al., 2012) comb., Saar-Nahe Basin (Germany; Permian). Liomopterum fuscatum represented by fewer...
Abstract Ammonoids suffered a diversity bottleneck during the Permian-Triassic mass extinction (PTME) and experienced rapid diversification in Early Triassic. However, kinds of ammonoids that were more likely to survive PTME fueled subsequent are still poorly known. We compiled comprehensive morphological data set used nonmetric multidimensional scaling method reveal impact on selectivity ammon...
Abstract This study presents new whole rock major and trace element, Sr-Nd isotopic, petrographic, geochronologic data for seven latest Permian (Changhsingian)–Late Triassic (Carnian) granitoid intrusions of the northwestern northeastern Taimyr Peninsula in Russian High Arctic. U-Pb zircon ages, obtained using secondary ion mass spectrometry (SIMS), sensitive high-resolution microprobe (SHRIMP)...
[1] A marine Permian-Triassic boundary (PTB) section at Nhi Tao, Vietnam, contains a series of at least 9 pyritic horizons characterized by concurrent decreases in pyrite S(dSpy) and carbonate C-isotopic compositions (dCcarb). The first and largest of the events that precipitated these pyritic horizons was coincident with the Late Permian mass extinction, while subsequent events were generally ...
The end-Permian mass extinction is well-known as the most severe mass extinction of the Phanerozoic. Terrestrial communities appear to have been strongly affected by the event, but the cause of the extinction remains enigmatic. Here we explore whether primary producer disruption (e.g., extinction of terrestrial plants) could have led to a collapse of end-Permian terrestrial ecosystems, using mo...
Carbon and sulfur isotopic data, together with biomarker and iron speciation analyses of the Hovea-3 core that was drilled in the Perth Basin, Western Australia, indicate that euxinic conditions prevailed in the paleowater column during the Permian-Triassic superanoxic event. Biomarkers diagnostic for anoxygenic photosynthesis by Chlorobiaceae are particularly abundant at the boundary and into ...
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