The ecological sequence of Hipparion fauna in the middle reaches of the Yellow River during Neogene  

作　　者：ZHANG Yunxiang YUE Leping CAO Hongxia 

机构地区：[1]The Key Laboratory of Northwest University Continental Dynamics,Ministry of Education,China,Xi’an 7J0069,China [2]Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710069,China

出　　处：《Chinese Science Bulletin》2002年第1期79-82,共4页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 49972004).

摘　　要：The faunal ecological type and sequence in the Tertiary red clay indicate that Hipparion fauna during the period 7.4-6.1 Ma in the middle reaches of the Yellow River is composed mainly of dorcadoides and mixed types. This represents semiarid veld environment with small fluctuation. The fossil assemblages characterized by the abundance of gaudryi types and even the occurrence of some Hominoid and Chalicotherium indicate an obviously warm and humid period since 5.3 Ma. The fossil assemblages during 3.4 Ma show the typical steppe fauna representing dry climate. It is indicated by the changes of ecological sequence that the cli-matic conditions in Pliocene are drier than that in late Mio-cene. The clay-skin content of red clay, which has a syn-chronous change with faunal features, is a rather good re-placing palaeoclimatic index.The faunal ecological type and sequence in the Tertiary red clay indicate that Hipparion fauna during the period 7.4–6.1 Ma in the middle reaches of the Yellow River is composed mainly of dorcadoides and mixed types. This represents semiarid veld environment with small fluctuation. The fossil assemblages characterized by the abundance of gaudryi types and even the occurrence of some Hominoid and Chalicotherium indicate an obviously warm and humi period since 5.3 Ma. The fossil assemblages during 3.4 Ma show the typical steppe fauna representing dry climate. It is indicated by the changes of ecological sequence that the climatic conditions in Pliocene are drier than that in late Miocene. The clay-skin content of red clay, which has a synchronous change with faunal features, is a rather good replacing palaeoclimatic index.

关 键 词：NEOGENE red CLAY HIPPARION FAUNA environment evolution. 

分 类 号：Q915[天文地球—古生物学与地层学]