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The regression which commenced in the Triassic continued through the Jurassic, with marine sediments confined to the western side of Northern, Western and Peninsular Thailand, while continental red-beds were deposited in Northern and Northeast Thailand. The marine facies are predominantly sandstone, conglomerate, mud-stone and limestone, and contain a fauna which includes bivalves, gastropods, corals, ammonites, brachiopods and foraminifera which indicate that the succession is of Toarcian to Aalenian or possibly Early Bajocian age.

With caveats discussed below, non-marine Jurassic rocks are widespread in NE Thailand where they are more than 1000 m thick and form part of the Khorat Group of the Khorat Plateau. They also occur, but are less widespread, in Northern and Peninsu lar Thailand. Age determinations are based mainly on vertebrates, bivalves and palynomorphs, although the position of the Jurassic-Cretaceous boundary remains under discussion.

After the widespread volcanic activity of the Triassic, the Jurassic was a period of apparent volcanic quiescence and there are no confirmed occurrences of volcanic rocks of this age.

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