276 Mr. Tarey's Statement of Geological Facts 



tention, is the \inconsolidated stratum of mingled i^Z/Vz/^, 

 Limestone, and dtcomnostd Basalt, which immcdiatelv 

 succeeds. The Licnestone is reddish, as if tinged by the 

 oxidaied iron of the basalt, the basalt friable as an earthy 

 mould, and the flints shivery, as if they hid underyone the 

 action of "intense heat. The flints which lie in greatest 

 number on the limestone vary in colour from a light pink 

 to a rosy red, and contain cavities with a yellow impalpable 

 powder, or minute crystals. They are often striped, as if 

 formed by successive depositions, and exhibit manifest 

 traces of Corals, Madrepores, and other marine exuvite, 

 which are supposed to have supplied the siHcious matter, 

 or to have served as its focus of attraction." "On the 

 beach near Glynn the Anomia gryphus, and the vertebrae 

 Pentacrines are found in abundance, in blue Limestone,^' 

 p. xi. — " In the Isle of Muck, near Larnc, ihere is a course 

 oi gray Limestone between the white, according to Mr. D. 

 Stewart," Mr. D. p. 68. — '•' On the Black mountain, that 

 species denominated phospJioric Limestone is met with ; 

 likewise at Church Bay in the Isle of Rathlin. On the 

 mountain just mentioned, at the height of about 1100 feet, 

 is a kind of calcareous Sandstone, containing a variety of 

 shells, among which some of our native ones may be re- 

 cognized, as Arcta glycinaris, Pectens, Cardium edulis, and 

 intermixed with the Mytilus instatus (figured in White's 

 Natural History of Selbourne), Ammonice serpulce, (Mr. 

 Templeman), &c. ScC. Mr. D. p. 68. 



Blue and white or dove-coloured Marhle is found on the 

 lands of Ballymurphy, two miles from Belfast; also in 

 Collin Glen, some of its white part being " as transparent 

 as statuary Marble." A fine red Marble inclosing reddish 

 Flints in Earner's Glen near Trummcry: a whin dyke 

 far advanced in decomposition to a yellowish or a reddish 

 ochreaeous substance, cutting through this and other quar- 

 ries to the SW, imparts these colours to the limestone near 

 it, making it mucii harder, finer in the grain, and more 

 crystallized, and which when cut and polished, are nearly 

 equal to the best imported marbles, but they cannot be 

 raised in large blocks, Mr. D. p. 67. 



From the circumstance of the upper or white Limestone 

 ted*" (:200 feet thick) never rising wholly above the Sea 



* Often mentioned as Chalk by writers; and some even who have visited 

 it of late, seem dispused to endeavour to identify it with the Chali? strata of 

 the soutii of England; a vain attempt surtly ? — On these accounts I was 

 sorrv to read ''chalky clilTs" in Mr. D. p. G■^\ and that the Gypsum far be- 

 low it " has probably been Chalk" p. 7S. — Dr. R. says 1-imestone" as white 

 as chalk," vol. xxxiii. p. 201. 



at 



