Distribution and depositional model of microbial carbonates in the Ordovician middle assemblage, Ordos Basin, NW China

WEI Liubin,ZHAO Junxing,SU Zhongtang,WEI Xinshan,REN Junfeng,HUANG Zhengliang,WU Chunying

Fig. 2. Large to giant sedimentary structures of microbial carbonates in Ordovician Majiagou Formation in Ordos Basin. (a) Microbial biostrome, about 60 cm thick and composed of oncolite limestone; bottom of Ma55; Guanjiaya section in Xingxian County; (b) Microbial biostrome composed of oncolite limestone; upper Ma55; Guanjiaya section of Xingxian County; (c) Stromatolite mounds composed of laminar-columnar stromatolite dolomite; Ma6; Jinsushan section; (d) Locally enlarged Fig. 2c; (e) Oncolite limestone; Ma55; Guanjiaya section in Xingxian County; (f) Laminar-columnar stromatolite dolomite; Ma6; Jinsushan section in Fuping.