Supported by the National Natural Science Foundation of China (Grant No. 40472015);the State Key Laboratory of Modern Paleontology and Stratigraphy (Grant No. 053102);as well as the Key Laboratory for Minerals and Resources, the Chinese Academy of Sciences
Spherical microfossils are present in the Hindeodus parvus zone of the Lower Triassic in Ziyun,Guizhou Province. They generally range from 0.15 to 0.30 mm across,with micritic wall and filled by micro-sparry calcites,...