http://www.kgs.ku.edu/PRS/Coal/weir.html
An isopach is a line on a map drawn through points of equal thickness of a certain unit of area. Above is a Isopach mapping of the Weir-Pittsburg coal reveals a coal that stays fairly consistent in thickness over an average of 2.5 miles (4 km). When overlaying contours of top Mississippian structure, the coal appears to follow the structural strike.
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