Isopach

http://seeps.geol.ucsb.edu/pages/isopach.html

According to the Merrian-Webster online dictionary, Isopach is “an isoline that connects points of equal thickness of a geological stratum formation or group of formations.” The map above is an Isopach map featuring the coast of Santa Barbara, CA. The different colors represent the amounts of sediment on the ocean floor, pink represents the greatest thickness.