Bogheadn.
/ˈbɒɡhɛd/ Applied attributively to a deep brown shale found in Boghead. See torbanite n.
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the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > shale > others
till1672
bass1686
bat1686
blue metal1699
scallop slate1711
black shale1730
shale-shiver1794
shale1825
till-stonec1830
Wenlock shale1834
famp1836
Boghead1858
oil shale1866
paper shale1874
symon1881
paste-rock1882
slasto1953
1858 Greg & Lettsom Man. Mineral. 16 Torbanite... Boghead mineral. Boghead coal.
1867 W. W. Smyth Treat. Coal & Coal-mining 18 It is by no means easy..to draw a distinct line of demarcation between cannel and the black basses, bats, or crisp shales, which occur in the coal measures... And between all these and the torbanite, or ‘Boghead mineral’, there exists a relationship which makes the difference only one of degree.
1919 Chambers's Jrnl. June 390/2 The famous oil-shale of Torbanehill, torbanite or bog-head cannel, is often regarded as a variety of cannel coal.
1937 Nature 20 Feb. 340/1 Boghead coal is a comparatively rare and valuable material yielding gas and paraffin on distillation.
1960 Gloss. Coal Terms (B.S.I.) 6 Boghead coal, Torbanite, coal resembling cannel coal in physical appearance and properties, but distinguished microscopically by the presence of the remains of algae.
This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2018).
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n.1858