These photos show typical rock sequence of Middle Triassic Semantan Formation, taken from Kg. Mela Lipis, Pahang. This formation is well-known comprises a rapidly alternating sequence of carbonaceous shale, silstone and rhyolite tuff where shale and tuff make up the bulk of the sequence. The common occurence of interbedded tuffaceous shale and silstone indicated that the volvanic activity was comtemporaneous with sedimentation.
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