A swell in geology is a domed area of considerable areal extent.[1] According to Leser, it is also called a sill (geology), and is a gently arched landform of various orders of size in topographic, sub-glacial or sub-hydric geology. It may be as small as a rock formation in a river or may assume continental scale.[2]
Original source: https://en.wikipedia.org/wiki/Swell (geology).
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