Definitions

1. adjective

relating to the Lias, a geological formation of the early Jurassic period, characterized by the marine reptile Ichthyosaurus and the ammonite genus Eoderoceras.

“The museum displayed fossils from the liassic period, including an impressive Ichthyosaurus skeleton.”

2. noun

a geological formation of the early Jurassic period, characterized by the marine reptile Ichthyosaurus and the ammonite genus Eoderoceras.

“The geologist studied the liassic rocks in the region to learn more about its history.”