四川雅江县上三叠统雅江组和两河口组深水遗迹化石的发现  

DISCOVERY OF DEEP WATER TRACE FOSSILS FROM LATE TRIASSIC YAJIANG FORMATION AND LIANGHEKOU FORMATION IN YAJIANG COUNTY,SICHUAN PROVINCE

作　　者：梁斌[1] 杨逢清[1] 郭建秋[1] 钟长洪 李振江 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]四川省地勘局区域地质调查队,四川成都610213

出　　处：《地质科技情报》2003年第3期41-44,共4页Geological Science and Technology Information

基　　金：中国地质调查局项目"康定县幅1:25万区域地质调查"(200113000004)

摘　　要：在雅江县雅江—道孚公路边的上三叠统雅江组—两河口组地层剖面上,首次发现了Protopaleodictyon,Phycosiphon,Planolites,Phycodes,Paleodictyon,Squamodictyon,Urohelminthoida,Lophoctenium,Ovatiichnum等9个遗迹属,共15个遗迹种,归属于Nereites遗迹相。遗迹化石及遗迹相特征反映该区上三叠统雅江组和两河口组的沉积环境为次深海—深海的大陆斜坡中下部—深海盆地边缘。Trace fossils have been first discovered in Late Triassic Yajiang Formation and Lianghekou Formation in Yajiang County, Sichuan. After determination, these trace fossils have been classified into 9 ichnogenera and 15 ichnospecies. Based on detailed study it, all these belong to Nereites ichnofacies. In term of trace fossils, it is suggested that the Late Triassic depositional environment in the area experienced the evolution from the middle-lower slope to abyssal basin margins.

关 键 词：遗迹化石 遗迹相 沉积环境 上三叠统 四川 雅江县 雅江组-两河口组 

分 类 号：P534.51[天文地球—古生物学与地层学] P535.271[天文地球—地质学]