Through the work of the Rogers brothers in Pennsylvania and Virginia and of Safford in Tennessee, the characteristic forms of Appalachian structure have long been familiar to geologists. The unsymmetrical fold has been recognized as the normal structural form through Pennsylvania, Maryland, and a portion of Virginia. In east Tennessee, the reversed fault, transverse to the steeper limb of the anticlinal, becomes common. Recent study in the southern Appalachians has shown a modification of these well-recognized types, namely, broad overthrust faults which, as developed in northwestern Georgia, are comparable in magnitude with those of the Scottish highlands and the Rocky Mountains as described by Geikie* and McConnell.

Stratigraphy of the Region.

The strata of the region shown in the accompanying map (plate 2) embrace representatives of all the larger groups of the Paleozoic from the Cambrian to the Carboniferous, inclusive. The formations appearing in the stratigraphic column, figure . . .

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