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讨论的大哺乳动物化石出自甘肃灵台雷家河村东南小石沟[72074(1)、72074(4)]和文王沟(93002)等地的新第三纪晚期地层。它们包括15种,分属8属、9科、4目,可能代表两个不同时代的组合。第一组合所在的地层层位是72074(4)剖面的L5~L3层和72074(1)剖面的第3层,主要由 Hipparion pater、Acerorhinus sp．、Nyctereutes．、 Hyaeninae gen．et sp．indet．和Gazella niheensis等类型组成,其性质与山西榆社高庄组南庄沟段和醋柳沟段产出的大哺乳动物的接近,时代可能为中上新世。第二组合所在的地层层位是72074(1)剖面的第2层,以Anancus sinensis 和Cervidae gen．et sp．indet．为代表,其性质与榆社麻则沟组动物群的相近,时代为晚上新世。
The large mammalian fossils discussed are from Late Neogene strata dating from Xiaoshiigou [72074 (1), 72074 (4)] and Wenwanggou (93002) southeast of Leijiahe Village, Lingtai, Gansu Province. They include 15 species, belonging to 8 genera, 9 families, 4 orders, possibly representing a combination of two different epochs. The stratigraphic horizon where the first assemblage is located is the L5-L3 layer of the 72074 (4) section and the third layer of the 72074 (1) section, which is composed mainly of Hipparion pater and Acerorhinus sp. , Nyctereutes. , Hyaeninae gen. et sp. indet. And Gazella niheensis, whose nature is similar to that of the large mammals produced in the Nanzhuanggou and the vinegarogougou of the Gaozhuang Formation in Shanxi Yushe, and may be in the Miocene epoch. The strata of the second assemblage are Layer 2 of the 72074 (1) profile, with Anancus sinensis and Cervidae gen. et sp. indet. As its representative, its nature is similar to that of Mazizegou fauna in Yushe, with the age of the late Pliocene.