Here is an image of Isopach lines. This one shows sandstone quality created from well logs. Isopaches are used to elevations and differences in height. The pink area shows that the sandstone is about 45ft thick, and the green is 25 ft thick.Image found at: http://www.cartage.org.lb/en/themes/Sciences/Earthscience/Geology/OilandGas/HydrocarbonExploration/GeologicMaps/SANDSTONE_MAP.jpg
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