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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The Brereton Limestone and Anna Shale were irregular in thickness. When one was thin or absent, the other was thick. Usually, the Anna Shale was 1 to 5 feet thick. Energy Shale was sometimes present, in pods up to 30 feet across. In some places, the glacial till eroded all rock above the coal, and sometimes the Herrin Coal was eroded completely. Generally, the overburden above the Herrin Coal was 25 feet of glacial deposits and 25 feet of bedrock. Slickensided fault planes were evident in the Herrin Coal in one pit. A dike was observed in the Springfield Coal. The interval between the Herrin and Springfield Coals was as low as 22 feet in one pit. Pyrite nodules were found in the Anna Shale and in the underclay of the Herrin Coal.
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