The image shown above is an example of an isopach map. An isopach map is a type of contour map that shows levels of thickness the rock or sediment in an area. The map above is showing the thickness of mineral coal in a region of America. The map uses both contour lines and color to differentiate the the mineral thickness and show the rate of change of thickness. The structure of the mineral deposits are very linear, as shown by the path of the contour lines. The blue regions have a thinner layer of mineral coal, and are shown in the Chautauqua and Elk region. The green regions have thicker mineral coal region and is dominated by the Montgomery, Labette, Neosho, Crawford, and Wilson regions.
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