Abstract:

After making a study of conchostracan fossils taken from the half way between Trong and Krabi on the southern Thailand of Malaya Penisula,the deposits bearing this fauna are thought to be Middle.Jurassic inage.Thus,it is most probably that there are two conchostracan levels found within Thailand so far.One be-longs to middle Upper Triassic by Kobayashi,and the other is ours of Middle Jurassic.

Key words: Thailand, Continental deposits, Biostrata