湖北宜昌黄花场早奥陶世生物礁中发现 Pulchrilamina  

PULCHRILAMINA FOUND IN EARLY ORDOVICIAN REEF AT HUANGHUACHANG,YICHANG,HUBEI

作　　者：朱忠德[1] 刘秉理[1] 李相明[1] 

机构地区：[1]江汉石油学院地质系,湖北江陵434102

出　　处：《石油与天然气地质》1993年第4期304-309,共6页Oil & Gas Geology

基　　金：国家自然科学基金

摘　　要：作者在湖北宜昌早奥陶世岩隆礁中发现了 Pulchrilamina,这在国内以及亚洲地区尚属首例.Pul-chrilamina 产于下奥陶统分乡组礁岩段,是一种独特的纹层状生物,由纹层和针刺组成.据纹理的发育状况、晶粒的结晶程度,可分为晶粒纹层、灰泥纹层和似纹层三类.其中,晶粒纹层具镶嵌结构,可形成粘结孔.针刺垂直生长于纹层上层面,呈下粗上细渐变尖灭.针刺长度、间隔距离、长度与直径比等均不具相关关系.晶粒纹层、似纹层的针刺尖端一般不抵达上覆纹层底面,而灰泥纹层的针刺则相反.笔者倾向于将 Pulchrilamina 暂时列入分类位置未定的门、纲、目之下的一个科,但据其形态,不排除隶属于某种藻类的可能性。在 Batostoma 岩隆礁中,Pulchrilamina 属于原地生长,就地保存,并以粘结方式建礁。Pulchrilamina was found recently in Early Ordovician bioherm at Huanghuachang,Yichang,Hubei Province.This is the first time to find this fossil in China and even inAsia.Pulchrilamina is a unique laminal organism occurred in reef rock member of theFengxiang Formation(O_1),and consists of laminae and spines.According to the develop-ment of laminae and the crystallographic degree,the laminae can be divided into crystallamina,lime mud lamina and lamina-like,crystal lamina has mosaic texture and couldform binding pores.Spinas grow erectly on the upper surface of the lamina and get thin-ner gradually like pin.The length,the distance and the ratio of the length to diameter isirregular.The spina ends of crystal laminae and lamina-like generally do not extend to thebase of the overlying lamina,but it is opposite for lime mud lamina.It is suggested by theauthors to put Pulchrilamina temporarily under a family among incertitude(or uncertain)phylum,class,order.According to the Pulchrilamin's configuration,it possibly belongsto a certain algae.In Batostoma baffling buildup,Pulchrilamina is of the kind that is grownand preserved in situ and is built up by binding.

关 键 词：早奥陶世 生物礁 纹层状生物 

分 类 号：Q911.642[天文地球—古生物学与地层学]