This work was supported by the National Basic Research Program of China(Grant No.2005CB422001);the National Natural Science Foundation of China(Grant Nos.90211013,40421101 and 40201007).
Fossil mammal-riched Neogene strata are widely distributed in the southeast corner of the huge Longzhong Basin at Tianshui, Gansu Province, northern central China. Hipparion weihoense, a typical member of late Middle ...