Difference between revisions of "File:Penn caseyville 2-3.jpg"
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Figure 2-3. Graphic log based on continuous core from Illinois State Geological Survey #1 Berry test hole in Sec. 8, T9S, R3W, Jackson County, Illinois. This is a reference section for the Caseyville Formation. QA = quartz arenite. © University of Illinois Board of Trustees.
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