Spencer G.LUCAS,Emily S.BRAY,Robert J.EMRY,Karl F.HIRSCH

• 1:新墨西哥州自然历史与科学博物馆
• 2:科罗拉多大学自然历史博物馆
• 3:史密森学会国家自然历史博物馆古生物学部

摘要(Abstract)：

在晚白垩世期间,哈萨克斯坦东部的斋桑盆地形成了一个湖盆,一直延续到现在。古斋桑湖中最老的沉积是Tayzhuzgen组,由厚达136m的泥岩、粉砂岩、页岩、石英砂岩、砾岩和淡水石灰岩红层组成。按照当地的地层名称,Tayzhuzgen组包括Manrak、Tayzhuzgen、Aulisbulak、Aktobe、Dysum bay和Kiin Kerish层。在斋桑湖以南的Tayzhuzgen河附近一个地点的Tayzhuzgen组下部,发现了恐龙蛋壳碎片,蛋壳至少包括有两个主要类型:圆形蛋类和长形蛋类。恐龙蛋壳指示了Tayzhuzgen组下部的时代为晚白垩世(可能是马斯特里赫特期)。在本组的较高层位,发现了晚?古新世的植物化石,因此斋桑盆地的白垩系-古近系界线在Tayzhuzgen组内部。在Tayzhuzgen组中,白垩纪与古新世化石层之间的地层间隔只有约50m,由此推测在Tayzhuzgen组内部可能存在一个或多个不整合,或是本组的中部为凝缩沉积,即在白垩系-古近系界线处的沉积速率非常缓慢。Tayzhuzgen组顶部有一个显著的不整合,那里中或晚始新世(Arshantan,Irdinmanhan或Egilian陆生哺乳动物"期")的地层存在于含哺乳动物化石剖面的底部。斋桑盆地的白垩系-古近系界线位于古斋桑湖沉积剖面的下部。这不是一个完整的界线剖面,可能是一个包含有一个或多个不整合和/或一个由慢速沉积造成的凝缩剖面。

关键词(KeyWords)： 恐龙蛋壳;古新世古植物群;始新世动物群;Tayzhuzgen组;白垩系-古近系界线;斋桑盆地;哈萨克斯坦

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(No.91114201);; 国家重点基础研究发展计划(2012CB821906)资助出版;; The National Geographic Society and Walcott Fund of the Smithsonian Institution supported field research

作者(Author): Spencer G.LUCAS,Emily S.BRAY,Robert J.EMRY,Karl F.HIRSCH

DOI: 10.19839/j.cnki.dcxzz.2012.02.018

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