Phu Wiang Geology
Phu Wiang is a stomach-shaped mountain range that stretches from the North to the South. In the middle of the eastern side of Phu Wiang is an inland basin surrounded by a ring of mountains with an elevated flat-top called a tableland.
The geology of the Phu Wiang Mountains is classified as non-marine Mesozoic rocks in the Korat Group, of which the strata was initiated in the time of the Jurassic Era. Other groups of the same geological time are Nam Phong, Phu Kradueng, Phra Wihan, Sao Khua, Phu Phan, and Khok Kruat formations. These rock Formations are covered on top by present day sedimentary rocks.
Dinosaurs were buried after their death in the sediments. Their remains became fossils over time. It was in the Jurassic Era when dinosaurs were present, so it is not surprising to discover a large amount of fossilised dinosaur skeletons in Phu Wiang including those fossils of Phuwiangosaurus sirindhornae and Siamotyrannus isanensis, that were excavated from the Sao Khua Formation, aged 130 million years and belonging to the early Cretaceous Era.
