Trias era (250-210 million years ago)
Gastropoda and Bivalvia increase, while amonit become public. Dinosaurs and large marine reptilia start to appear the first time during this period. Reptilia-like mammal called a meat eater Cynodont start growing. Mammals first began to appear at this time. And there are many kinds of reptilia live in water, including turtle and tortoise. Sikada palm-like plants grow and spread conifer.
Pangea continent and move north to form desert. Ice sheets in the southern and melt midst of Pangea began to form.
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