Abstract
Northern Thailand has numerous basins filled with the Tertiary non-marine Mae Moh Group more than 2000m thick. They are composed of sand, silt, clay, and lignite beds indicating lacustrine and fluvial environments, and yield plenty of Miocene mammalian fossils including hominoid and Proboscideans. These sedimentary basins were formed as pull-apart basins by the left-lateral faulting along the Red River fault and the Wang Chao faul due to the southeast movement with clockwise rotating by the India-Asia collision.
