Montpelier Quadrangle
Mining in the Montpelier Quadrangle
The Rock Island Coal was the only seam mined. However, the lenticular and discontinuous coal, known locally as the Caseyville Coal (stratigraphically below the Rock Island Coal), may have been the seam mined in some cases, especially by low-volume short term local mines. Both coals undulate and vary considerably in thickness, thickening and thinning from both the top and the bottom of the seam.
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Coal Mines In Illinois Montpelier Quadrangle