. Catalog of cores from the sub-Galena Group in Illinois. Borings; Prospecting; Prospecting; Natural gas; Geology, Stratigraphic. Figure 2 Cores from the Platteville Group. CATALOG OF SUB-GALENA GROUP CORES. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shaw, Thomas H. (Thomas Howard); Sargent, Michael L. (Michael Leroy); Illinois State Geological Survey. Champaign, Ill. : Illinois State Geological Survey

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Keywords: ., bookcentury1900, booksubjectbor, booksubjectgeologystratigraphic