n. (Geol.) A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria. [ 1913 Webster ]
v. i. (Mining) To incline from the vertical; to hade; -- said of a vein, fault, or lode. [ 1913 Webster ]
n.
v. t. [ AS. underlecgan. See Under, and Lay, v. t. ]
n.
v. i. (Mining) To incline from the vertical; to hade; -- said of a vein, fault, or lode. [ 1913 Webster ]
n.
v. t. [ AS. underlecgan. See Under, and Lay, v. t. ]
n.