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The Triassic sedimentary rocks of Thailand represent the beginning of a Mesozoic regression which saw widespread marine conditions gradually giving way to continental conditions which spread from the east to the west. The most marine of the Mesozoic systems is therefore the Triassic, which contains in places rich faunas that prove an almost complete succession to be present.

This was a period of considerable tectonic and igneous activity and Palaeotethys, which separated the terranes of Sibumasu and Indochina, probably closed at this time. The Triassic granite chains which run the length of the country are described by Cobbing (2011) while the belts of volcanic rocks, many of them Triassic, which run through Northern, NE and SE Thailand, are described by Barr & Charusiri (2011).

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