The ISGS Manuscripts Collection consists of unpublished papers and documents generally written by survey staff. Includes theses or other manuscripts of potential interest to survey staff.
Digital Geologic Quadrangle Maps in the Geologic Map Schema (GeMS) format. Each map has been converted from the original (internally developed) GIS database schema to GeMS format and published in the National Geologic Map Database.
Digital data and photographs concerning geologic samples from the Illinois Precambrian Basement. Includes all known Precambrian core samples in our Geologic Samples Library, selected core samples of igneous intrusions associated with fluorite mining available to us, and hand samples of igneous rocks potentially carrying Precambrian xenoliths that were transported to the surface near Hicks Dome in the Illinois-Kentucky Fluorspar District.
Location maps, borehole records, and related information from mining companies in the Illinois-Kentucky Fluorite District Includes scans of original Ozark-Mahoning Mining Company historical records acquired in 2019. Fluorspar District Borehole Records
