This is not a true structure map;rather it represents a combination of post-Mississippian topography and structure, the latter imposed by post-Pennsylvanian tilting.

• 这不是一张真正的构造图，确切地说，它代表着密西西比纪后的地形和在宾夕法尼西纪后又经翘起的构造的综合形象。