Permian fusulinacean faunas of Thailand — event controlled evolution

The evolution of the fusulinacean faunas of Thailand during Permian times is controlled by bioevents. The first bioevent happened in the upper Lower Permian and is characterized by the disappearance of the Arctic-Tethyan elements. This bioevent can be correlated with the closure of the Urals and a worldwide regression. The second bioevent happened at the boundary Middle/Upper Permian to lower Upper Permian (Midian). It is characterized by the extinction of approximately 90 % of the fusulinaceans. This bioevent is controlled by the orogenic evolution of the Kunlun and the Petchabun fold and thrust belt, which again led to a worldwide regression. The third bioevent happened at the boundary Permian/Triassic. It is characterized by the final extinction of the fusulinaceans and might be controlled by the isostatic uplift of the newly formed mountain belt.