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hu bei yi chang huang hua chang zao ao tao shi sheng wu jiao zhong fa xian pulchrilamina
Author(s): 
Pages: 304-309+363
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  Pulchrilamina纹层针刺粘结作用早奥陶世Batostoma岩隆礁;
Abstract: 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。
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