江苏泰县五通组观山段胞石Grahnichitina pilosa的发现及其意义  

DISCOVERY OF GRAHNICHITINA PILOSA (CHITINOZOA) FROM THE GUANSHAN MEMBER OF THE WUTUNG FORMATION IN TAIXIAN OF JIANGSU WITH DISCUSSION ON ITS SIGNIFICANCE

作　　者：耿良玉[1] 张允白[1] 丁连生 钱泽书 刘春莲[4] 唐鹏 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]华东石油地质局地质研究所,江苏扬州277002 [3]江苏石油勘探开发公司地质研究所,江苏扬州225261 [4]中山大学地球科学系,广州510275 [5]新疆石油管理局勘探开发研究院,新疆克拉玛依834000

出　　处：《古生物学报》2000年第4期535-543,共9页Acta Palaeontologica Sinica

基　　金：中国科学院南京地质古生物研究所现代古生物学和地层学开放实验室基金;中国科学院古生物与古人类学特别支持费资助项目

摘　　要：根据江苏泰县N 4井五通组观山段顶部的胞石Grahnichitinapilosa的发现 ,确定观山段的时代为中泥盆世吉维特期。据此认为 :擂鼓台段的两层暗色泥岩 ,应分别对比为南洞页岩、长顺页岩 ;中泥盆世大海侵时 ,华南海沿苏皖河经皖南、苏南入侵苏北。There have been three opinions concernig the age of the lower division, the Guanshan Member of the Wutung Formation since the paper by Ting (1919), who then called it the Wutungshan Quatzite, namely 1) Givetian to early Frasnian (Feng, 1987), 2) Frasnian (Li, 1963, 1965; Cai and Li, 1982; Li et al. , 1984), and 3) Strunian (Cai et al. , 1998). However, no reliable age indicators were found within the member. At a depth of 2 358 m of Well N 4 in Taixian of N. Jiangsu gray argillaceous siltstone sandwiched within redbeds yields the chitinozoan species Grahnichitina pilosa (Collinson et Scott, 1958). This species was ever widespread in the world, including U.S.A. (Collinson and Scott, 1958, Dunn, 1959, Morgan,1967, Urban ,1972), Brazil (Boekel, 1968), Ghana (Anan Yorke 1974), Libya (Paris et al. , 1985, Streel et al., 1988), Argentina (Volkheimer et al. , 1988), Algeria (Boumendjel, 1987), and China. It was recorded from the Solon and Lower Rapid members of the Cadar Valley Formation of Illinois and Iowa (Collinson and Scott, 1958, Dunn, 1959, Urban, 1972) where the conodonts are representative of the Middle varcus to hermanni cristatus zones of Givetian age. Therefore, the discovery of G. pilosa confirms a Givetian age for the subsurface Guanshan Member.

关 键 词：胞石 观山段 五通组 中泥盆地 

分 类 号：Q91[天文地球—古生物学与地层学]