midland basin geology
While the Wolfcamp formation in both the Midland and Delaware Basins is very similar, stratigraphic nomenclature of Permian Basin aged strata is different.
PSUpper Pennsylvanian and Lower Permian Shelf-to-Basin Facies Architecture and Trends, Eastern Shelf of the Southern Midland Basin, West Texas*
Two rock groups are found in Strathearn separated by the Highland Boundary Fault. To the north lie the crystalline metamorphic rocks. South are younger.