作者：王晓鸣，李萍

摘要：报道了发现于宝格达乌拉地区的少量古近纪化石材料(包括零碎的牙齿和头后骨骼)。材料产自不整合覆盖在细粒红层之上的河相沉积物，显示出再沉积特点。经鉴定，它们可归入Breviodon minutus, Rhinocerotidae gen. et sp. indet., Brontotheriidae gen. et sp. indet.及其他未定奇蹄类。材料在时代上确属古近纪无疑，但产出层位的时代尚有疑问。宝格达乌拉地区过去只出产新近纪脊椎动物化石，古近纪的地层和化石都未曾报道。根据新化石点与附近地层的接触关系，我们怀疑这些古近纪化石是后期再沉积在新近纪的宝格达乌拉组中的。新材料的发现提示该地区可能还有更多的古近纪地层。

关键词：内蒙古宝格达乌拉，古近纪，新近纪，奇蹄类，脊齿貘科，犀科，雷兽科，距骨，趾骨

卷期：49卷 01期

A New Fossil Site with a Re-worked Paleogene Assemblage at Baogeda Ula, central Nei Mongol

WANG Xiao-Ming, LI Ping

Abstract  We report a small Paleogene fossil assemblage in a predominantly Neogene basin in the Baogeda Ula area. A small pocket of fluvial sediments rests unconformably above fine-grained red beds. Fragmentary dental and postcranial materials are recovered from the fluvial beds. Many of the fossils show signs of having been reworked. The limited collection contains Breviodon minutus, Rhinocerotidae gen. et sp. indet., Brontotheriidae gen. et sp. indet., and others. This assemblage has a Paleogene characteristic, but the age of the fossil-producing sediments is uncertain. Although the possibility exists that this is an unaltered Paleogene deposit, we suspect the Paleogene fossils were reworked into the Neogene Baogeda Ula Formation.
Key words  Baogeda Ula, Nei Mongol; Paleogene, Neogene; Perissodactyla, Lophialetidae, Rhinocerotidae, Brontotheriidae; astragalus; phalanx