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a. A horizontal crack or fissure in massive rock.
See also: bedding plane
b. One of a set of cracks or fissures parallel with the bedding of a rock.
Webster 3rd
c. A horizontal joint between courses of brick. ARI
d. The horizontal layer of mortar on (or in) which a masonry unit is laid.
ACSG, 1
Source:
Dictionary of Mining, Mineral, and Related Terms
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