ribbon rock

ribbon rock

[′rib·ən ‚räk]
(petrology)
A rock showing a succession of thin layers of differing composition or appearance.
References in periodicals archive ?
May I through September 30, 2-hour tours take you to chambers filled with stalactites, stalagmites, helictites, ribbon rock ("cave bacon"), and globular formations known as "cave popcorn" ($4 ages 12 and over, $2 ages 6 through 11, plus $3 vehicle entry fee).