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III.—The Grit-rocks of the Eastern Border of North Wales
Published online by Cambridge University Press: 01 May 2009
Extract
The sandstone beds which skirt the eastern border of Wales, and stretch from a little south-west of the town of Oswestry to near the Point of Ayr, on the shores of the Irish Sea, a distance of upwards of 40 miles in a direct line, have for several years past been a source of perplexity to those who have investigated their peculiarities, and who have been interested in arriving at a determination of their true age and geological horizon.
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References
page 263 note 1 The Millstone-Grits of the North Wales Border, by D. C. Davies, of Osweatry. Vol. vii., pp. 68 and 122.
page 264 note 1 I here adopt the usual phraseology which represents the Carboniferous Limestone and the Yoredale rocks as distinct formations, this is however merely a conventional division for the convenience of classification, beyond which it has no significance.
page 264 note 2 The regular passage from the Limestone rocks to the overlying Grit will be rendered apparent by consulting the two sections given by D. C. Davies in the Geological Magazine, Vol. VII., p. 69, Fig. 2, and p. 70, Fig. 3.
page 265 note 1 The following passage, extracted from Phillips's Geology of Yorkshire, will serve as an illustration of this subject. In describing the Yoredale series, at p. 36, the author observes— “The Southern series (Craven) consists almosts entirely of argillaceous laminated rocks, locally changing to Limestone and Chert, generally productive of ironstone, and containing marine exuviæ. The Northern type (Teesdale) consists of the same argillaceous basis (less calcareous, and of a coarser grain), with the addition of many layers of Sandstone, distinct beds of Limestone, thin coal seams, and sand plants;” see also section at page 37 of the same work. Also at page 6 of the Memoirs of the Geological Survey of North Derbyshire and the adjoining parts of Yorkshire, by A. H. Green, F.G.S., C. Le Neve Foster, B.A., etc., and J. R. Dakyns, M.A.
page 265 note 2 See section and description, by A. H. Green, M.A., F.G.S., of the “Lower Carboniferous rocks of North Wales,” Geological Magazine, Vol. IV., p. 12; also description by D. C. Davies, Geological Magazine, Vol. VII., pp. 70 to 72.
page 265 note 3 Geological Magazine, Vol. VII., p. 73.
page 266 note 1 Transactions Manchester Geological Society, Vol. VII., p. 25.
page 267 note 1 Geological Magazine, Vol. IV., p. 11.
page 267 note 2 Transactions Liverpool Geological Society, 1868 and 1869, p. 75.