α. 1600s– wayboard, 1600s waboard.
β. 1800s weighboard.
wayboardn.
/ˈweɪbɔːd/, U.S. /ˈweɪˌbɔrd/ Mining and Geology (originally English regional (Derbyshire)).
A thin layer, typically consisting of clay of volcanic origin, separating or delimiting thicker strata of rock.Dating of quot. ?1644 at α. is uncertain; it comes from a MS copy dated 1777.
ΘΚΠ
the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material between > between ore
wayboard?1644
white-row1665
α.
β. 1802 J. Mawe Mineral. of Derbyshire Gloss. 211 Weighboard, clay intersecting the vein.1860 J. E. Worcester Dict. Eng. Lang. Weighboard, clay intersecting a vein. Ansted.?1644 G. Hopkinson Laws & Customs Mines Wappentake of Wirksworth (1948) 5/1 Those which we call way boards, which Lye fflat the soal and Rood stones being close togather.
1747 W. Hooson Miners Dict. sig. L3 These Leaps never happen but at some Way-board, or large Bed-joynt.
1811 J. Farey Gen. View Agric. Derbyshire I. 246 The Toadstones, and the Way-boards, effect in general, a complete separation, even to the water, in the different parts of the vein.
1884 Mineral. Mag. & Jrnl. Mineral. Soc. 5 305 Some may consider that greater probability attaches to the view that they represent what Nicol terms ‘wayboards’, or belts of decomposed igneous rock.
1903 Q. Jrnl. Geol. Soc. 59 342 The limestones in this cutting are, like those in the Cold-Eaton cutting, divided by wayboards of clay.
1976 T. R. Owen Geol. Evol. Brit. Isles v. 78 He concluded that these English wayboards were the argillation products of contemporaneous volcanic ashfalls.
2002 W. L. Barrett & G. Walton in P. W. Scott & C. M. Bristow Industr. Minerals & Extractive Industry Geol. 153/1 Movements might take place due to..adversely inclined strata with rotten basalts and clay way-boards.
This entry has been updated (OED Third Edition, December 2015; most recently modified version published online June 2022).
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n.?1644