The top boundary of Jurassic is delimitated between the lower and middle part of Datonghe Formation.
侏罗系上界暂定在大通河组下部与中部之间。
In terms of lithology, fossil records and sedimentary facies, the Cretaceous in the Bazhou depression, Minhe basin is subdivided into Datonghe, Hekou and Minhe Formation.
民和盆地巴州拗陷的白垩系按其岩性、化石特征和沉积相自下而上分为大通河组、河口组和民和组。
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