ACRITARCH BIOSTRATIGRAPHIC SUCCESSION OF THE EDIACARAN DOUSHANTUO FORMATION IN THE YANGTZE GORGES
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Abstract:
The Ediacaran Doushantuo Formation in the Yangtze Gorges is subdivided into four lithostratigraphic members in ascending order. Member 1 is about 1.5-5m thick cap dolomite with tepee-like structures,sheet cracks. Member 2 consists of 90-120m thick organic-rich dolomitic limestones and interbedded black shales,with abundant black chert nodules. Member 3 is 40-70m thick and consists of grey dolostones with thin bedded chert and irregular chert nodules. Member 4 is about 10-20m thick and consists of black shal...
