Hogback

In geology and geomorphology, a hogback, or hog's back, is a long, narrow ridge, or chain of hills, with a slender crest and steep slopes of nearly equal angle on both sides. The term is usually reserved for a ridge produced by the differential erosion of steeply tilted, uniformly dipping sedimentary rock strata, where one flank follows the dip slope of the tilted stratum while the opposite flank is an erosion face cutting across the dipping beds. The name comes from the Hog's Back of the North Downs in Surrey, England, whose outline was thought to resemble a hog back, and geologists also apply the term loosely to drumlins and, in Maine, to eskers and ridges called horsebacks.