The most profound mass extinction in the Phanerozoic occurred at the end of the Permian,with global loss of nearly 90% of marine invertebrate species and 70%
Sea lilies of the family Isocrinidae represent one of the main groups of crinoids in modem oceans and are todays dominant stalked crinoid group.They are abl
Ichthyosanrs,especially post-Triassic forms,were successfully adapted to life in marine environment.Although research on ichthyosaurs dates back to the 18th ce
The Sichuan Basin iS one of the largest terrestrial basins in China with rich oil and gas resources.The extensive distribution and development ofthe Mesozoic