瓶状微化石研究中几个问题的讨论  

ON THE VASE-SHAPED MICROFOSSILS

作　　者：曹芳[1] 

机构地区：[1]中国地质科学院天津地质矿产研究所,天津300170

出　　处：《微体古生物学报》2000年第3期327-332,共6页Acta Micropalaeontologica Sinica

摘　　要：近年来笔者研究了扬子地台的一些瓶状微化石 ,积累了丰富的资料并有一些新的认识。本文围绕瓶状微化石研究讨论了如下两个问题 :1 )关于早寒武世早期的瓶状微化石与开腔骨类 ;2 )震旦系与寒武系瓶状微化石的关系。Some vase shaped microfossils(abbr. VSMs) from Yangtze Platform of China have been studed in resent years, based on which, two qustions are addressed as follows. 1. As everyone knows, all the blades separated from the Chancelloriids possess clear joint sides (pl.Ⅰ, fig.18, see also text fig.1), but VSM's test is rounded, therefore there cannot be joint sides. A specimen illustrated in pl.Ⅰ, fig.19 may represent aggregated VSMs, and there are no the joint sides among their tests. This feature suggests that the Chancellorrid sclerite and VSM may belong to the different organism. They are simillar in appearance but distinct in nature. The VSM(pl.Ⅰ, figs. 1-12) itself is a whole body of organism, but the Chancelloriid's blade (pl.Ⅰ, figs.13-16) is only a dismembered part post mortem, it is typically composite. Thus it can be seen that the Chancelloriids may be even more complex than the VSMs in systematics. In addtion, both of them are different in the ratio of length to width, the oral position, the symmetry the cross section and so on. In view of the above, the auther came to the conclusion that the VSMs are not comparable to the blade of Chancelloriid. The auther differs with Qian et al.(1999) who consider that the VSMs from the early Cambrian are the blades which separates from the Chancelloriids. 2. In China, VSMs occur not only in the Late Precambrian (Sinian), but also in the early Cambrian. The fossils in above mentioned two horizons are similar in their shapes. Some of them may be of identical genus. The cotinuity in age of the distribution also shows that the microorganisms with the test of a vase in the early Cambrian are continuous from the Precambrian. In other words, they are of same biological affinity.

关 键 词：瓶状微化石 开腔骨类 寒武系 震旦系 

分 类 号：Q91[天文地球—古生物学与地层学]