Age distribution of the fauna 5.3 Ma B. P. and climatic deterioration events in North China

摘要

THE climatic deterioration is an important event in the geological history and generally recog-nized by composition of strata and variation in some elements. However, the study on the cli-matic deterioration events in terms of age distribution of animals has been rarely reported.This note reports the study on a climatic deterioration event and its affected area during theMiocene Epoch based on thousands of fossils of Hipparion fauna from Longjiagou in Wudu,