1989年夏，辽宁省喀左县村民在帽儿山采石时发现一石灰岩溶洞的堆积物中含有哺乳动物化石，遂报该县博物馆。喀左县博物馆有关人员当即赴现场调查，收集到若十化石。同年秋，辽宁省文物考古研究所派专人前往试掘，清理了剖面，并大致了解该地点的情况。1994年笔者等”进行了正 In the summer of 1989, villagers in Kaizuo County, Liaoning Province, found a limestone cave deposit containing mammalian fossils in quarrying at Maoershan and reported to the county museum. Kaizu County Museum personnel immediately went to the scene investigation, collected ten if fossil. In the autumn of the same year, the Liaoning Provincial Institute of Cultural Relics and Archeology sent a special person to try the excavation, cleared the profile and got an overview of the location. In 1994, I "was positive