Original component of grain size index in core sediment from southwestern slope of the South China Sea and its paleoenvironmental implication

Traditional grain size analysis was basically used to discriminate sediment type based on its particle dimension for sedimentary naming[1,2] and to analyze the dynamic feature of transport medium, including water current and wind strength[3―5]. Recently, some patency advances havebeen made by using different methods to separate different grain sizes in various original composition from sediments for searching a new way of paleoenvironmental study[6―8]. Grain size analysis is even playing an …     

龙门山地区D－C界线附近微古生物化石新材料

文章介绍了四川龙门山地区Ｄ－Ｃ界线附近的微体化石新材料，计描述９属（１新属）、８种（４新种）、３亚种（新亚种）。     

河南西峡湾潭地区二郎坪群微体化石研究

报道了河南省西峡县湾潭地区二郎坪群火神庙组硅质岩夹层中的牙形石类Ａｃｏｄｕｓｏｎｅｏｔｅｎｓｉｓ及放射虫类ＥｎｔａｃｔｉｎｉａｃｏｍｐｌａｌＩａｔａ，其时代应属早、中奥陶世；与其相邻的大庙组泥质板岩中发现的螺旋管状藻类化石及其管状微化石的组合面貌可与早寒武世小壳动物群对比。这些化石的发现为二郎坪群的时代归属提供了较为可信的证据。