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Redating Chaohusaurus (Ichthyopterygia) from Early Triassic of China with ammonites



Ben Creisler
bcreisler@gmail.com

A new online publication:

Cheng Ji, Chao Zhang, Da-Yong Jiang, Hugo Bucher, Ryosuke Motani &
Andrea Tintori (2014)
Ammonoid age control of the Early Triassic marine reptiles from Chaohu
(South China).
Palaeoworld (advance online publication)
doi:10.1016/j.palwor.2014.11.009
http://www.sciencedirect.com/science/article/pii/S1871174X14000791


Here we described a series of ammonoid specimens from the Early
Triassic of Chaohu, South China and recognized the occurrence of
Procolumbites for the first time in this area. The Procolumbites layer
is about one meter above the first appearance of Chaohusaurus,
indicating that the oldest Chaohusaurus is within the Procolumbites
Zone of middle Spathian age. This new age constrain is significantly
older than the previously suggested Subcolumbites Zone assignment
(early late Spathian). To date, Chaohusaurus is the oldest known
ichthyopterygian.