Paleobotanic evidences for climate getting hot from the bajocian to the early bathonian in southern border or north China platform

摘要

Three flora assemblages of Yima formation, in western Henan are systematically studied. The begin- ning time from which the climate in this region during the middle Jurassic and the late Jurassic period getting hot was Bajocian to early Bathonian, obviously earlier than in south Europe, middle Asia, and Siberia.