A B C 图2-4根据交错层理确定岩层顶、底面 A.顶面在左边,正常层序;B.岩层直立,顶面在右边;C.顶面在右边,岩层倒转 Determination of the top and bottom surfaces from cross-bedding, the oblique laminae converge to the bottom of the bed A-normal beds, top to the top left; B-vertical beds, top to right; C-overturned beds, top to the bottom rightDetermination of the top and bottom surfaces from cross-bedding, the oblique laminae converge to the bottom of the bed A– normal beds, top to the top left; B– vertical beds, top to right; C– overturned beds, top to the bottom right