川西峨眉晚白垩世夹关期河流沉积中的痕迹化石群落  

ICHNOCOENOSIS OF ALLUVIAL JIAGUAN FORMATION (UPPER CRETACEOUS), EMEI, SICHUAN, CHINA

作　　者：胡斌[1] 吴贤涛[1] 

机构地区：[1]焦作矿业学院,河南焦作454159

出　　处：《古生物学报》1993年第4期478-489,532-534,共12页Acta Palaeontologica Sinica

基　　金：中国科学院科学基金

摘　　要：晚白垩世夹关组中的痕迹化石群落至少由12个痕迹属17个痕迹种组成,其中包括5个新痕迹种,即Cystichrtium cuwatitivum,Steinichnus laryus,Paradidymaulichnus emeiertsis,Monmorphichnus lineates和Rusophycus univalvis.这一化石群落主要是无脊椎动物的进食迹、觅食迹、爬迹、停息迹和居住迹,其中多数呈下浮痕和全浮痕保存,并形成于经常干旱的河流环境(大多出现在泛滥平原沉积中).该群落可识别出两个痕迹化石组合,即1) Scoyenia-Steinichnus-Rusophycus组合,它主要产自泛滥平原和漫滩环境;2)Skolithos-Arenicolites组合,它代表一种水道砂坝或曲流砂坝环境.This ichnocoenosis from the Upper Cretaceous Jiaguan Formation consists at least 12 ichnogenera and 17 ichnospecies including 5 new ichnospecies, namely, Cystichnium curvativum, Steinichnus largus, Paradidymaulichnus emeiensis, Monomorphichnus lineatus and Rusophycus univalvis, which represent Fodinichnia, Pascichnia, Repichnia, Cubichnia and Domichnia of invertebrates such as Vermes, Mollusca, Arthropoda (Mainly insects) and others. Most of the trace fossils were formed in a regularly desiccated fluvial environment (mostly occurring in flood plain deposits), and preserved in hyporelief and full relief.Two ichnofossil assemblages are recognized: (1) Scoyenia-Steinichnus-Rusophycus Assemblage, which is principally of the flood plain and overbank origin; and (2) Skithos-Arenicolites Assemblage, representing an entirely aquatic channel bar or meandering bar.

关 键 词：痕迹化石 古环境 晚白垩世 

分 类 号：Q911.33[天文地球—古生物学与地层学]