Geologic Resources Inventory Appalachian National Scenic Trail Geologic Index Maps (as of May, 2017)
The Appalachian National Scenic Trail geologic map index is a collection of zipped multipage PDF documents (APPA_GRI_<state>_index_map.pdf) showing available geologic mapping for 7.5 minute quadrangles that are intersected by the APPA administrative boundary (as of 2017).  Additionally, a map index readme file …