![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMi23bCcGvpgIUtv3zfix8-6J1zXCIXzm840aDWi5ZJs5yYhsXNYY4JpWsiUS_ZIVXYeRFzB0ZuzxKTHD1tja-LNrCasF65yuTYJpmoDWLwN-xYFRl62Yv6vKR56kVLecFvIKewsyKi6Bj/s400/riverton-SM.jpg)
Isopachs are contours that display the stratigraphic thickness of a rock unit as opposed to the true vertical thickness. This is an image from the Kansas Geological Survey of the Riverton coal. It shows that Riverton coal stays at a fairly consistent thickness over an average distance of 5 miles.
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