130 PROCEEDINGS OF SOCIETIES. 



before. The old red sandstone near Cookstown contains thin bands of 

 limestone, and the gray limestone in the country southwards, contains 

 thin bands of whitish sandstone, as seen at the Rock quarries near 

 Pomeroy, at Donaghrisk, and other places. 



10. At Killymeal, near Dungannon, the limestone is of a dull dark 

 gray colour, and argillaceous. The fossil shells it yields are generally 

 of a pure white colour, and very perfect. It is one of the best loca- 

 lities in Ireland for getting Eenestella and other delicately marked 

 corals. 



11. At Monaghan the colour of the limestone is of light gray, and it 

 is very siliceous. The Court-house stands on a band of this. 



12. At Colooney, near Sligo, is a limestone nearly black; it is very 

 fine-grained, compact, and has a conchoidal fracture. It appears as if 

 it would yield a good hydraulic lime, or give a good polish as a marble. 



13. There is a black oolitic limestone at Crosspatrick, near Killala, 

 in Mayo. The old Abbey at Moyne is built of it. 



14. There is black marble at Westport. 



15. A very light gray oolitic limestone occurs in thin beds atBalla, 

 in Mayo, near the top of the limestone, being covered there by the Coal 

 series of Slievecorran : the thin flags of this limestone give a ringing 

 metallic sound when struck with a hammer. 



16. Dark gray marble, nearly black, with a few small white spots, 

 is at Angliham, near Galway. Some slabs are got here with a black 

 ground, having white corals (Syringopora) in radiating lines, which 

 make a very pretty appearance when polished. 



17. There is a gray marble at Merlin Park, near Galway, exactly 

 similar to that called the half-moon beds at Raheendoran, near Carlow. 



18. There is a light gray oolitic limestone at Toberory, near Tulsk in 

 Roscommon, differing from the gray oolite at Balla in Mayo, in having 

 thicker beds. This oolite contains the usual fossils of the limestone. 



19. A grey oolite occurs at Edenderry, in the King's County, which 

 is very massive, and in the quarries assumes a columnar aspect. A 

 similar grey oolite is at Donaghmore, near Rathdowney, Queen's County. 

 It is also at Doon, and at Rushhall, both in the neighbourhood of Bor- 

 ris-in-Ossory ; but in those two latter localities it occurs in ordinary beds 

 — the massive columnar appearance is wanting. 



20. A light gray, thick-bedded, brittle limestone occurs at Moore, 

 near Ballinasloe in Roscommon, almost composed of a minute coral 

 like Stromatopora, which I think is undescribed. I distinguished this 

 by the name of the Stromatopora limestone, and it occurs in many places 

 in Ireland. 



21. A brownish-red marble, mixed with gray spots, occurs atBally- 

 mahon, in Westmeath. 



22. At Clonmacnois, King's County, the marble has a gray ground 

 with small white spots, the whole being a mass of Encrinite stems. 

 Marble exactly similar in appearance and colour is got at Palliskenry 

 in Limerick, and at Carrigaline in Cork. 



23. At Clonony, near Ferbane, the marble is yellowish-brown, mot- 



