An Upper Miocene “Hipparion fauna” locality sandwiched by basalt in Hanjiaying, Nei Mongol
Received date: 2020-10-21
Online published: 2021-04-20
Here we report a Hipparion fauna locality discovered in between two basalt layers near Hanjiaying Village, Jining District, Wulanchabu City, Nei Mongol. K-Ar isotopic dating of the lower and upper level of the basalt constrains the age of the fauna from 7.2 to 6.8 Ma. Compared with classical Hipparion fauna from northern China, the Hanjiaying fauna is closer to those from Baode of Shanxi, Siziwang Banner of Nei Mongol and the Linxia Basin of Gansu. It is similar to the Loc. 43, 44 and 49 from Baode by faunal composition, confirming their age to be ~7.0 Ma rather than 5.5 Ma. The high similarity with the fossils from Wulanhua, Siziwang Banner, Nei Mongol, verified the age of Wulanhua fauna at about 7 Ma. Compared with faunas from the Linxia Basin, Gansu, it is more similar to those from the upper part of the Liushu Formation, especially the Yangjiashan fauna. Based on the faunal composition and their tooth morphology, the Hanjiaying fauna could be included in the “Gazella dorcadoides” fauna, which is supposed to be at the west paleobiome in northern China during the Late Miocene.
Key words： Nei Mongol; Jining District; Late Miocene; Hipparion fauna; K-Ar dating
WANG Qian, LIU Yan, WANG Li-Hua, Mikael FORTELIUS, ZHANG Zhao-Qun . An Upper Miocene “Hipparion fauna” locality sandwiched by basalt in Hanjiaying, Nei Mongol[J]. Vertebrata Palasiatica, 2021 , 59(2) : 125 -137 . DOI: 10.19615/j.cnki.1000-3118.210323
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