http://pubs.usgs.gov/dds/dds-033/USGS_3D/ssx_txt/depomod.htm
Isopach maps are used to show the thickness of a area's stratum. They show lines that have been connected to one another by points of equal thickness. This maps shows the thickness of sandstone in a specific area. This maps does a good job of showing how the sandstone is less think near the top and slowly begins to thinking as it goes down.
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