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Related to key bed: dendrochronology
key bed[′kē ‚bed]
Also known as index bed; key horizon; marker bed.
A stratum or body of strata that has distinctive characteristics so that it can be easily identified.
A bed whose top or bottom is employed as a datum in the drawing of structure contour maps.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.