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陕西省186煤田地质勘探队于1982年在彬县县城西北的坡头村南小章沟內,发现大量哺乳动物化石。彬县一带塬高、沟深,坡陡,沟壑纵横,水土流失严重,海拔高度一般在1100—1300m,气候属典型大陆性半干旱性气候。小章沟呈北东南西向,沟长5km,沟内流水为常年性支流,但流量较小。 含哺乳动物化石的小章沟组不整合于白垩纪志丹群洛河砂岩之上,其岩性在下部以棕褐色砂砾岩或含砾砂岩为主;中、上部以棕褐色粘土及砂质粘土为主。最大厚度为
186 coal geological prospecting team in Shaanxi Province in 1982 in Binxian County northwestern slope of the village of small village ditch found a large number of mammalian fossils. Binxian area plateau high, ditch deep, steep slopes, ravines aspect, soil erosion is serious, the altitude is generally 1100-1300m, the climate is a typical continental semi-arid climate. Small Zhang ditch showed north-east, south-west, ditch length 5km, ditch water perennial tributaries, but the flow is small. The Xiaozhanggou Formation, which contains mammalian fossils, is not integrated with the Luohe sandstone of the Cretaceous Zhidan. Its lithology is dominated by brown sandy conglomerate or pebble sandstone in the lower part. The brown clay and sandy clay in the upper and middle parts are the Lord. The maximum thickness is