内蒙古赤峰红花沟原太古宇中的微体化石及其意义探讨

本文报道了在内蒙古赤峰市红花沟石头道村东山，原认为属太古宙的地层中所发现的多门类微体化石群，其大地构造位置的华北地台北缘内蒙地轴东部。化石群包括见于我国南方寒武世梅树阶的软舌螺类，似软舌螺类，棱管壳类，齿形壳类，开腔骨类，原牙形刺类，单板类，球形壳类，口盖化石等；也有本区特有蠕虫管类及藻类化石，共计２０属２０种（其中２新属３新种，１相似种，１０未定种）证明该区原太古宇中的部分地层时代应属晚震旦世一

MICROFOSSILS FROM STRATA ORIGINALLY KNOWN AS THE ARCHEAN IN HONGHUAGOU, CHIFENG, INNER MONGOLIA

The Honghuagou area of Chifeng City is tectonically located on the northern margin of the Inner Mongolian axis. Microfossils were collected from siliceous marble at East Hill of Shitoudao Village, in the western part of the Honghuagou gold mine. Fossils described here include 12 groups, 20 genera (2 new) and 20 species (3 new, 1 cf. sp. and 10 sp. indet. ), such as Hy- olithids, Hyolithelmithes, Shiphogonuchitiida, Conodomorpha, Chanceloriida, Protoconodonta, Globomorpha, Monoplacophora, Operculum, Worm-tubes, and Algae. There are many mem-bers of the Meishucun fauna always developed in southern China and also elements of the Qinghezhen fauna. Among the above taxa, Protoclosterium lenis Tan (gen. et sp. nov. ) may be divided into three types of joining according to the characteristics of the apical end: (1) joining in the same direction; (2) dislocated joining in the same direction; and (3) joining in different di-rections. The siliceous marble bearing the microfossils which was originally assigned to the Archean may be considered to be of Late Sinian-Early Cambrian age.