Key bed

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Related to Key bed: dendrochronology
Same as Key seat.

See also: Key

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Her "finger drops" consisted of playing each pitch of a five-note scale with a single finger, dropping onto each key with full arm weight all the way to the key bed. Forcing, pushing and "banging" were not allowed.
One sequence, having several meters of shale and sandstone, lacking fossils, had such adistinctive colour that it could be applied as a key bed. There were several metres of thin to medium-bedded Claraia vermicular limestone inter-bedded with coloured shale above the key bed; this belonged to the Early Triassic, based on a study of conodont fragments.
I moved it back and forth, up and down, into the exposed crevices, swooped over moving black and white dots from one end of the key bed to the other.