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XVIII. — Notes on a small Patch of Silurian Rocks to the West of Abergele, 

 on the Northern Coast of Denbighshire ; visited I8th and 19 fh July, 1837. 



By JOHN EDDOWES BOWMAN, Esq., F.L.S. 

 Communicated by R. I. MURCHISON, Esq., V.P.G.S. 



[Read April 25, 1838.] 



Section from Llandulas, three miles west of Abergele, on the north coast of Denbighshire, to Garthewin, distance neaily 



six miles. 



South, a 



North. 



a Blue slate, with shells and Encrinites. 



b Fine blue clay. 



c Arenaceous limestone. 



d .Arenaceous red conglomerate. 



e Red marl, with pebbles. 

 / Green micaceous sandstone. 

 g Carboniferous limestone. 



IVIY attention was first directed to this locality by Mr. John Price, of the New 

 College, Bristol, who had discovered it during his temporary residence at Llysfaen. 

 It lies immediately to the south of the narrow belt of carboniferous limestone which 

 skirts the coast from the Great Orme's Head near Conway, as far as the Point of 

 Air and the Estuary of the Dee eastwards ; and a little to the west of the brook 

 Dulas, which discharges itself into the sea at Llandulas, about three miles west 

 of Abergele. The belt of limestone is not here above a mile broad, and the dip 

 of its strata is N. or N.E. Its southern limit (and also a great transverse rent 

 through which the Dulas passes) shows the bold mural precipices so characteristic 

 of this formation. Near the base of the precipices at Craig y Forwyn are a seam of 



2c2 



