passage bed

passage bed

[′pas·ij ‚bed]
(geology)
A stratum marking a transition from rocks of one geological system to those of another.
References in periodicals archive ?
Particularly striking is the China Passage Bed, a rattan frame capped with pineapple finials.
Pinfold [6], declared the same sequence as "Passage beds" in Attock area.
Cotter [11] described these beds as 'passage beds' consisting of argillaceous limestone, marl and shales, sometimes 6 m thick or so, overlyingthe "massive Hill limestone".