α. 1747. Hooson, Miner’s Dict., L 3. These Leaps never happen but at some Way-board, or large Bed-joynt.
1818. W. Phillips, Geol., 137. The limestone strata contain thin beds of clay, termed by the miner way-boards.
1859. Page, Handbk. Geol. Terms, Wayboards, a mining term, now pretty generally employed by geologists to designate any thin layers or bands that separate or define the boundaries of thicker strata.
β. 1802. J. Mawe, Mineral. Derbysh., Gloss. (E.D.S.), Weighboard, clay intersecting the vein.
1860. Worcester.
1864. Webster. (And in later Dicts.)
