Through field geological investigation,it is determined that the unconformity contact between Tuanshanzi and Dahongyu formations of Changcheng Group in Xingcheng,Liaoning Province.In Jiashan,the top of stromatolite dolostone in the 3rd Member of Tuanshanzi Formation develops the ancient karst landform while there are basal conglomerates in the bottom of Dahongyu Formation.On the contact surface,we can see the conglomerates of Dahongyu Formation are filling in the dolomite of Tuanshanzi Formation along the K...