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Tuchengzi Formation
The Tuchengzi Formation () is a geological formation in China whose strata spans the Tithonian (Late Jurassic) to Berriasian (Early Cretaceous) ages.〔Liu Y.-Q. Kuang H.-W., Jiang X.-J., Peng N., Xu H. & Sun H.-Y. (2012). "Timing of the earliest known feathered dinosaurs and transitional pterosaurs older than the Jehol Biota." ''Palaeogeography, Palaeoclimatology, Palaeoecology'' (advance online publication).〕 Dinosaur fossils, particularly footprints, have been found from the formation.〔Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Jurassic, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 550–552. ISBN 0-520-24209-2.〕
==Vertebrate paleofauna==
The Tuchengzi Formation was deposited during a time of transition between the Daohugou Biota and the Jehol biota. The Tuchengzi represents a poorer, more arid climate that appears to have caused much of the Daohugou fauna to become extinct. They would later be replaced by the Jehol biota when conditions became more favorable to a diversity of terrestrial animal life.〔
Indeterminate sauropod remains formerly attributed to the Mamenchisauridae and Brachiosauridae have been found in Liaoning, China.〔 Theropod tracks, including those made by avialans, have been found in Liaoning, China.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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