The Pennsylvanian area of north-central Texas may be described in reference to the sedimentary formations of the Mid-Continent as two great inliers of Carboniferous sediments that protrude through Cretaceous strata on the east and dip beneath Permian rocks on the west and north. The two areas are separated by a narrow tongue of Trinity sand, and the southmost outcrop butts against Ordovician rocks for a short distance along the Llano uplift so that the southern portion does not truly possess the relationships of an inlier. The shape and exact location of these Pennsylvanian areas are shown on the map (...
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