Fig. 2

Comprehensive stratigraphic column of the Ediacaran Doushantuo Formation in the Chengkou area. 1 –Samples used for thin section analyses; 2 – Carbonaceous shale; 3 – Carbonaceous mudstone; 4 – Argillaceous siltstone; 5 – Siltstone; 6 – Coarse sandstone; 7 – Calcic coarse sandstone; 8 – Gravel-bearing coarse sandstone; 9 – Fine conglomerate; 10 – Glacial conglomerate; 11 – Coarse crystalline limestone; 12 – Manganese-bearing dolomite; 13 – Sandy siliceous dolomite; 14 – Siliceous rock; 15 – Manganese-bearing oncolite dolomite; 16 – Micrite rhodochrosite; 17 – Oncolitic rhodochrosite; 18 – Oolitic rhodochrosite; 19 – Stromatolite rhodochrosite; 20 – Stratiform stromatolite; 21 – Stratiform-columnar stromatolite; 22 – Columnar stromatolite; 23 – Micro-columnar stromatolite; 24 – Micro-branched stromatolite; 25 – Horizontal bedding; 26 – Trough-cross bedding; 27– Normal-graded bedding. In the comprehensive stratigraphic column, the Member I of the Doushantuo Formation is from the Lijiagou section in the Gaoyan, Chengkou area; and the Member II of the Doushantuo Formation is from the drilled well ZK01