SILICIFIED MICROFOSSILS FROM THE EARLY CAMBRIAN TIANZHUSHAN MEMBER NEAR MIAOHE VILLAGE, ZIGUI, WEST HUBEI, CHINA
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Abstract:
Silicified microfossils from the lowermost Cambrian (Tianzhushan Member) at Miaohe village, Zigui County,Hubei Province are described and their biostratigraphic significance is analyzed. All microfossils were observed in thin sec-tions of chert. The assemblage in the lowermost Cambrian contains rich small-sized spiny acritarchs dominated by Micrhystridiumampliatum Wang 1985 (=Micrhystridium lanceolatum L. Yin 1985) associated with Paracymatiosphaera spp., other sphericalforms Leiosphaeridia, Favososphaeridium, Eoaperturilites, and filaments Obruchevella and Megathrix. Most of them weremistakenly described as the components of the Doushantuo assemblage (Sample Hm80-14-2, in L Yin, 1985) and someauthors subsequently quoted the incorrect information.Exactly, the real Doushantuo chert in Miaohe, Zigui contains large and morphologically complex acritarchs, uncompli-cated filamentous and coccoidal microfossils (C. Yin, 1996). The discovery of bonafide Doushantuo and lowermost Cambrianassemblages at Miaohe provides important evidence for the stratigraphic correlation of this section with those Sinian-Cam-brian transition strata in adjacent areas and confirms the distinctness of the Doushantuo biota.
