pullished respecting Antriniy DerrT/, (Sc. 277 



at the north-end of the trough, in the distance of 25 miles 

 from Ballycasllc to Solomon's Porch (Dr. R. vol. xxxiii. 

 p. 202), and sinking wholly below it, near the mouth of 

 the Bann, I am not surprised, that the previous account 

 of Dr. R. which I had read, of the northern BasaUic Coast, 

 takes no nonce of the incumbent coloured and shelly beds 

 of Limestone, above mentioned : the mention however 

 which Dr. R. makes of this stratum, rising as it passes S 

 and inland from Solomon's Porch (vol. xxxiii. p. 202), 

 might have given occasion to observe and describe the 

 whole of this grand calcareous stratum. From Portrush, 

 vvhfre the Limestone first emerges from the Sea at the end 

 of the Trough in Antrim, Mr. D. has pretty fullv described 

 its edge, to Baliycastle, and thence across the inland 

 mouutams to near Newtownglens, and thence along the 

 Coast, witliin a few mdes of it, and of Belfast Bay and 

 the Laaan River, to near Soldier's Town, (App. p. 29), 

 and to Maharlin in the County of Down, Mr. D. p. 63 to 

 G9, 93, &c.; I shall therefore dismiss this stratum for the 

 present : and proceed to 



Tklrd — The Great Hasallic stratum Testing on the Lime- 

 stone last described, whose 16 curious strata or thick beds 

 (together 1200 feet thick, vol. xxxv, p. 376), Dr. R. has 

 exhibited and described in your 33rd vol. p. l66, and of 

 which some further information from Dr. R. will be found 

 in Mr. D.'s App. p. 17, with a separate memoir on the 

 Zeolites imbedded in these Basalt strata and the Ochre or 

 red decomposing beds interposed between them, App. p. e. 

 Mr. D.'s accoui'it of these strata, pages 38 to 60, will also 

 be perused with interest by Geological readers: at pao-e 60 

 he mentions Iron Ores of different kinds, and thin strata of 

 rich Hematites found among the beds of argillaceous Ochre: 

 and liog Ore on the fides of the moimtains, and in the val- 

 leys between them; and from which sources, probably, the 

 Iron-works that were formerly used JNT of Randalstown, 

 were supplied with Ore, p. 473; and tlie Iron (Furnace) 

 Foundery on the shore of Lough Neagh in Derry, by strata 

 of Iron Ore stretching from that place to Slieve Gallon 

 Mountain, a distance often miles, (in this Basalt?) accord- 

 ing to Mr. Barton, p. 140 and 144. 



Po2;zo/««o of good quality has been worked from these 

 ochreaceous beds in Rathlin Isle, Mr. D. p. 6l, and Dr. R. 

 App. 12. Fullers' Earth, at the Falls of Belfast, Bamcr's 

 Glen, p. 62 and 67; Soa/j-stone of a purple colour, in a 

 large stratum SW of Lame, p. 61 ; Tripoli of a rough kind 

 on the SW of Agncw's hill, p. 62 ^ Frenck-Clialk near the 



Gobbins 



