Geology
Malaysia is located on the Sunda shelf, and is tectonically inactive. The oldest rocks in the country date from 540million years ago, and are mostly sedimentary. The most common form of rock is limestone, formed during the Paleozoic Era. Limestone laid down in East Malaysia during the Tertiary period has since eroded, and such erosion forms basins of sedimentary rocks rich in oil and natural gas. The mountain ranges in Malaysia were formed through orogenesis beginning in the Mesozoic era.
Read more about this topic: Geography Of Malaysia