Total:  1550 image files in 5 folders.   6.41GB
all in JPG format. 
single JPG file ranges from 840 kb to 10.59 MB
1958-2020

author and contact: 
Hong-He Xu
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences
39 East Beijing Road, Nanjing, 210008
China
E-mail: hhxu@nigpas.ac.cn