Bedrock Geology Map, Grafton Quadrangle, (Illinois Portion), Jersey and Calhoun Counties, Illinois
33" × 43" map sheet; includes legend, descriptive text, stratigraphic column, photograph, and cross section
2002; originally 1997
GIS Download (GeMS):
Purchase this map online through Shop ISGS*, or contact the Sales and Information Office for more information.
*excludes EDMAP series and student maps