An isopach is yet another style of contour map. The isolines on these maps represent the rock or sediment thickness of a geographic feature. The map above features a volcano with a layer of ash after an eruption. The contour lines actually measure the amount of ash (or sediment) on each section of the volcano.
http://www.volcano.si.edu/volcano.cfm?vn=357100&bgvn=1&rnum=region15&snum=andes_c&wvol=lonquim&tab=1
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