An isopach map is a type of contour map that measures equal rock or sediment thickness. Isopachs disregard geological reasons for thickening and thinning of different formations. Isopachs can be useful for many reasons such as estimating the volumes of volcanic ashes. The isopach pictured above uses contour lines and colors to show the difference in sediment thickness of the Rio Blanco Tephra Deposit.
http://www.geo.utexas.edu/faculty/barker/kempter/rbtephra.html
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