The nonmarine Cretaceous deposits of Transbaikalia are divided into the Turginian and Kutinskian suites which contain plant megafossils which indicate late Neocomian to Aptian, and Aptian-Albian ages, respectively. The floristic succession suggests a cooling during Kutinskian time. Evidence for this also found in the mgration of the temperate-subtropical ecotone some 200 km to the south.
