Calibrating the Early Cretaceous Urho Pterosaur Fauna in Junggar Basin and implications for the evolution of the Jehol Biota
نویسندگان
چکیده
Over the past decades, abundant and well-preserved vertebrate fossils, known as Urho Pterosaur Fauna, have been recovered from Lower Cretaceous Tugulu Group in Junggar Basin, Xinjiang, NW China. Excavated materials belong to pterosaur, plesiosaur, dinosaur, crocodylomorph, turtle taxa. As such, they provide key insights into evolutionary history of several critical groups Early Cretaceous. The assemblages interpreted belonging Jehol Biota sensu lato, representing its northwesternmost geographic extent. This research presents a new chemical abrasion−isotope dilution−thermal ionization mass spectrometry U-Pb age 135.2 ± 0.9 Ma (2σ internal error) tuffaceous bed stratigraphically below fauna-bearing layers, indicating Valanginian maximum for fauna. Combined with available biostratigraphic data, results bear important paleobiologic implications vertebrates. First, Dsungaripterus pterosaur Psittacosaurus ornithischian fauna appear emerged earlier than previously believed. Second, data suggest that oldest carcharodontosaurids Asia appeared during Stage extend range basal coelurosaurs crocodyliforms. Our do not support notion lato migrating far west Basin their later stages. information calls question temporal spatial bases conventional, three-stage theory Biota.
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ژورنال
عنوان ژورنال: Geological Society of America Bulletin
سال: 2023
ISSN: ['1943-2674', '0016-7606']
DOI: https://doi.org/10.1130/b36795.1