grike

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grike

[grīk]
(geology)
A vertical fissure developed along a joint in limestone by dissolution of some of the rock. Also spelled gryke.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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"What you will find in areas like this, particularly with the geology around here - the clints and the grykes - the litter will actually fall into those and it'll stay there.
Crouching down to take a closer look at the grykes and clints on the otherwise fiat plain of Bryn Alyn, I notice that many of these oddly shaped fissures are sheltering some tiny plants called Hart's tongue fern from the strong winds and driving rain that regularly assault these exposed ridges.
The crevices (grykes) of the limestone pavements provide the right sheltered and shady conditions for relatively rare plants like purple saxifrage, yellow saxifrage, alpine meadow grass, hoary whitlow grass, lesser meadow-rue, wall lettuce, and baneberry.