The gray rock must have started out as a sedimentary deposit , got buried , lithified into rock , scrunched up so the layers became vertical , risen to the surface , and then eroded down like a folded phone book cut horizontally .

灰色岩石形成的流程是矿床沉积，掩埋，固化，堆积，然后岩层直立、上升，再被侵化成一个类似水平切过的折叠电话簿的东东。