Isopach maps (top left projection)are used to measure rock or sediment thickness. This map is measuring limestone/shale thickness in upper New York state
(http://images.google.com/imgres?imgurl=http://www.searchanddiscovery.com/documents/2007/07022lash/images/ani04.gif&imgrefurl=http://www.searchanddiscovery.net/documents/2007/07022lash/index.htm&usg=__pYyJ2M4QmXUChs3Hy8miD1lAO34=&h=425&w=600&sz=209&hl=en&start=15&um=1&itbs=1&tbnid=CHpTWxVBDvBBkM:&tbnh=96&tbnw=135&prev=/images%3Fq%3Disopach%2Bmap%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DN%26rls%3Dorg.mozilla:en-US:official%26tbs%3Disch:1)
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