广西合浦盆地晚白垩世和古新世的介形类化石
Acta Micropalaeontologica Sinica(2011)
Abstract
本文报道合浦盆地晚白垩世乌家组和古新世上洋组的介形类化石14属23种(描述1新种),可划分两个化石组合:(1)Rhombicyprideaquadrata-Heterocypris hepuensis-Li mnocythere sinuata组合,属于Talicypridea动物群,产于乌家组,时代为晚白垩世;(2)Sinocypris excelsa-Cypris concina-Parailyocypris changzhouensis组合,属于Sinocypris动物群,产于上洋组,时代为古新世。乌家组和上洋组为连续的湖相沉积,整合接触,沉积物为颗粒细小的泥岩、泥灰岩和粉砂岩,富含保存良好的介形类化石,将来逐层系统采集,能查明非海相K/E界线地层介形类化石纵向分布规律,是建立介形类化石组合序列,划分化石带和研究K/E界线的理想地区。
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Key words
Guangxi,Late Cretaceous-Palaeocene,Hepu Basin,Ostracod assemblage,K/E boundary
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