The pink rocks are Arkosic Sandstone, mudstone, siltstone, reddish-brown, sloping, rounded scree, and sandstone in the upper part of the rock hierarchy. There are freshwater and brackish water bivalve remains at the bottom of the stratigraphy (JKL rock information from dmr.go.th) from coastal sediments. Sedimentary rubble from the foothills which is influenced by the tide - down as well as may be found in lowland plains, up to wet lowland areas Mangrove swamps and estuaries