Surficial Geology of Alton Quadrangle, Madison County, Illinois
32" × 88" map sheet; includes legend, descriptive text, inset maps (2), photographs (3) and cross sections (2)
GIS download contains ArcGIS geodatabase and metadata, ArcReader map document, and published map in PDF format (GIS file contents).
Purchase this map online through Shop ISGS*, or contact the Sales and Information Office for more information.
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