我国新元古代叠层石的性状编码

THE MORPHOLOGICAL CHARACTERISTIC CODE OF NEOPROTEROZOIC STROMATOLITES IN CHINA

叠层石性状编码是运用一组阿拉伯数字记录叠层石各种性状的编码。反映一个叠层石形态和结构特征的性状主要包括柱体形态、大小、高度、分枝方式、分枝频率、层理形态、叠置方式、柱体边缘特征、横断面形态和微结构等十个项目。编码的每一个序列代表上述每一个项目,每一种叠层石的性状编码由10个阿拉伯数字组成。而每个序列的阿拉伯数字则代表此项目的不同性状。本文在对前人资料的深入剖析的基础上,记录我国新元古代常见的叠层石(西北39属种,东部47属种,湖北大洪山和神农架19属种,扬子区埃迪卡拉纪6属种)的性状编码。

＂The morphological characteristic code of stromatolites＂ documented in this paper is composed of 10 items, shape of columns, average diameter and height of columns, style and frequency of branching, shape of laminae, style of lamina arrangement, surface features of columns,form of cross section and microstructure. The sequence of these items in this code is constant, with each item consisting of 5-9 divisions, and each division representing a definite morphological characteristic. On the basis of this coding system, each of Neoproterozoic columnar stromatolites in China can get a morphological characteristic number, which consists of 10 digits （see Table Ⅱ- Table Ⅴ）.