bowl crater

bowl crater

[′bōl ‚krād·ər]
(astronomy)
A type of lunar crater whose interior cross section is a smooth curve, with no flat floor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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As they detail in the November 2016 issue of Icarus, concentric craters are apparently simple bowl craters that have been modified by goings-on below them.