symonn.
/ˈsʌɪmən/, U.S. /ˈsaɪmən/ local.
Name for a kind of red shale; also attributive. symon fault n. an interruption of a seam of coal by shale or other material (see quots.).
ΘΚΠ
the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal > part of coal seam
symon fault1834
swilly1836
split1877
underply1883
wall-coal1886
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
1834–6 Prestwich in Trans. Geol. Soc. (1840) 2nd Ser. V. 432 ‘Symon fault’.. is occasioned by the gradual..substitution of the coal by clay, shale, or sandstone,..the proportion of which rapidly increases, until it entirely replaces the coal.
1839 R. I. Murchison Silurian Syst. i. vii. 101 Even the coal..tapers away and disappears amid the shales and sandstones, constituting what are locally termed ‘Symonfaults’.
1881 G. F. Jackson Shropshire Word-bk. Suppl. Symon, a sort of red shale, same as Calaminca, q.v.—Colliery; M[iners'] T[erm].
This entry has not yet been fully updated (first published 1919; most recently modified version published online March 2022).
<
n.1834