![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfA0x26YOn7XUDlE-mEQvFuQiMHjes1xtHMIPKBv8juCYqEdVkpXL9Nr7NNbQsByo9JjaSxQQ9l6RCtZ_Q7vNQSajjSO7I1vQj4aPJf1APhfpnIuT93BaIWHneSqpISgVlJ7ES5rWjrNHc/s320/figure3_lrg.jpg)
An isopach map is a map of the areal extent and thickness variation of a stratigraphic unit; used in geological exploration for oil and for underground structural analysis. This is a map of Regina Clay, it shows the different layers indicated by color also the depth is indicated.
source: http://earthnet-geonet.ca/images/vft/sask/rwe/figure3_lrg.jpg
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