http://higheredbcs.wiley.com/legacy/college/levin/0471697435/chap_tut/chaps/chapter10-06.html
Above is an example of a isopach map which is used to show different variations in thickness within a certain stratum. These are also contour lines that show equal thickness over an area and are utilized many times in sedimentology, stratigraphy, as well as volcanology. Above is an illustration over the North Eastern United States.
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