The ecological sequence of Hipparion fauna in the middle reaches of the Yellow River during Neogene |
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Authors: | Yunxiang Zhang Leping Yue Hongxia Cao |
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Institution: | (1) Ministry of Education, The Key Laboratory of Northwest University Continental Dynamics, 710069 China, Xi’an, China;(2) Institute of Earth Environment, Chinese Academy of Sciences, 710069 Xi’an, China |
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Abstract: | 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. |
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Keywords: | Neogene red clay Hipparion fauna environment evolution |
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