一、引言 我国第四纪研究方面,最近二十年来,在许多公开发表的,或内部刊印(如高等院校的讲义)的,有关我国南方第四纪(及部分新第三纪)的地层、地质史、动物群、古地理与古动物地理方面的书籍、文章以及各种报告中,都可以见到“下草湾系(组)”、“巨河狸动物群” I. INTRODUCTION In Quaternary research in our country, in the past two decades, many published or internally printed (such as the lecture of institutions of higher learning) about the Quaternary (and some Neogene) strata in southern China Geological history, fauna, palaeogeography and ancient animal geography books, articles and various reports, you can see the “under the grass Bay Series (group)”, “giant beaver animal group”