| 9 | Age distribution of the fauna 5.3 Ma B. P. and climatic deterioration events in North China显示文摘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, | Zhang, YX Chen, DL Xue, XX | 1997 | Chinese Science Bulletin1997，42，21： | 1 |
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