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.
Reptiles 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.
Crustaceans Plants == See also ==