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Software brand: The Triassic U–Pb age for the aquatic long-necked protorosaur of Guizhou, China
Author: YANBIN WANG
DETING YANG
JUAN HAN
LITING WANG
Professional thesaurus: SHRIMP U–Pb zircon geochronology, volcanic tuff;Panxian Fauna
Date of first publication: 2014-02
Publisher: Institute of Geology Chinese Academy of Geological Sciences
Abstract: The ancient marine limestone beds of the upper part of the Guanling Formation, Panxian County, Guizhou Province, SW China, yielded a wide range of high-diversity well- preserved marine reptiles such as the fully aquatic protoro- saur with an extremely long neck Dinocephalosaurus ori- entalis, the oldest mixosaurid ichthyosaurs and lariosaurs. However, there is no precise isotopic age to study the in- triguing origin, evolution and emigration history of the im- portant fauna. We report a sensitive high-resolution ion mi- croprobe (SHRIMP) U–Pb zircon age for a volcanic tuff bed within the upper part of the Guanling Formation. The result indicates that the age of the fossil horizon is 244.0±1.3 Ma, 14 Maearlierthanthepreviouslyestimatedagebasedoncon- odont evidence. We consider that the marine reptiles had a relatively rapid evolution during Middle Triassic time, some 8 Ma after the end-Permian mass extinction.
URI: http://www.igeodata.org/handle/20.500.11758/353
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