Description: Cross section lines from Geologic Maps 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 and Open File Report 54. Last update Aug 2025. Accompanying point file (cross_sections_geomaps_labelendpts) is used to label cross section line endpoints (A, A', B, B', etc).