Skiddawn.
/ˈskɪdɔː/, U.S. /ˈskɪdɔ/, /skəˈdɔ/, /ˈskɪdɑ/, /skəˈdɑ/ Geology.
1. Skiddaw slate n. (also Skiddaw slates) a thick group of slates, flags, and mudstones that outcrops in the northern part of the Lake District and out of which Skiddaw and neighbouring mountains have been eroded.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > slate > type of
slate1704
Skiddaw slate1832
1832 Proc. Geol. Soc. 1 401 Skiddaw slate.—The author briefly describes the range and extent of this group.
1855 J. Phillips Man. Geol. vi. 108 These..occupy a long range of mountains parallel to the Skiddaw slates.
1933 H. H. Symonds Walking in Lake District x. 255 Thus came the ‘Skiddaw slate’, that earliest rock of Cumberland, found par excellence in Skiddaw himself.
1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles v. 102 The Skiddaw Slates have been slightly metamorphosed..by later intrusions... However, the early Ordovician seems to have been devoid of igneous activity—unlike Wales—and only late in Skiddaw times did it commence.
1977 R. Prosser Geol. explained in Lake District i. 13 The oldest rocks [of the Lake District massif], the Skiddaw Slates.., have their main exposures north of a line from Ennerdale Water, past Derwentwater to Troutbeck and include the hill masses of the Skiddaw range.
2. Used attributively to designate the lowest division of the Ordovician in Britain, esp. in the Lake District.
ΘΚΠ
the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Ordovician > specific
Caradoc1835
Tremadoc1847
Arenig1854
Skiddaw1897
Cincinnatian1899
Skiddavian1905
Caradocian1910
Tremadocian1910
1897 Index Vols. I.–L. Q. Jrnl. Geol. Soc. 357/1 Skiddaw age of Easdale Slates.
1900 Proc. & Trans. Royal Soc. Canada 6 iv. 200 There is a remarkable similarity between the Ordovician of..Quebec and New Brunswick and the Ordovician of western Europe as developed in Great Britain: The Skiddaw and Arenig, the Hartfell and Llandeilo formations, being easily recognized in Canada.
1969 [see Skiddaw slate n. at sense 1]. This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022).
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n.1832