The North China type Cambrian and Early Ordovician strata can be subdivided into 7 Formations, 21 biozones and 10 stages.
河南省华北型寒武纪—早奥陶世地层可分为7个组、21个生物带、10个阶。
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The allopatric coral fossils are collected in the olistostromes of the Upper Triassic Zhuwo Formation in Mandi, Zamtang, and two biozones of Triassic bivalves are established.