An angular unconformable contact was for the first time found between the Middle Jurassic Bathonian Stage and its underlying pre-Ordovician metamorphosed basement in the Chawola district, in Nyainrong County.

• 摘要在聂荣县查吾拉区一带首次发现中侏罗统巴通阶与下伏前奥陶系基底变质岩系之间呈角度不整合接触。