This image illustrates part of the geological map of Highland County, Virginia in the Valley & Ridge province. Note the linear belts Paleozoic sedimentary rocks that are repeated by folding. From oldest to youngest these include O1 = lower Ordovician strata, O2 = upper Ordovician strata, S1 = Silurian strata, SD = Silurian-Devonian strata, D1 = lower Devonian strata, and D2 = middle and upper Devonian strata. The red blobs are igneous intrusions (primarily basalt and andesite) that formed 35 to 55 Ma, and are Virginia’s youngest igneous rocks.
Highland County Geologic Map
August 2, 2016 by ·