BRITISH ASSOCIATION. 
239 
On some Beds of Limestone in the Valley of Corkj hy C. Y. 
Haines, M.D. 
This outlying portion of the carboniferous system is described 
as consisting of three thin beds of ferruginous limestone, inter- 
stratified with carboniferous slate and yellow sandstone, forming 
part of a series underlying the limestone of the Cork valley ; it is 
situate at Eiverstown, and crops out at the summit of an anticlinal 
elevation ; the limestone and slate contain Encrinites, Turbino- 
lise, Spirifers, &c. Dr. Haines also exhibited some rare and un- 
described fossils from the Cork limestone, and a slab of millstone 
grit from Kilrush, County Clare, containing some new and ex- 
traordinary impressions, apparantly of a marine Annelid, slightly 
resembling a species of Myrianites figured in Mr. Murchison^s 
Silurian system, and occurring in the Cambrian slates. 
On the Old Red Sandstone, or Devonian, and the Silurian Dis- 
tricts of Ireland, hy R. Griffith, Esq, 
The author stated that he should consider these two systems 
together, on account of the difficulty of separating the Silmian 
strata, which were characterized by fossils, from the Devonian, 
which in Ireland were only known by position and mineral cha- 
racter. The most northern district coloured as old red sand- 
stone on Mr. Griffith's map, extends from Enniskillen, in the 
county of Fermanagh, to Pomeroy, in the county of Tyrone ; and 
from Lisbellaw to Lisnarick, in the county of Fermanagh, occu- 
pying an area of about 300 square miles. To the north and 
north-west it is bounded by granite and metamorphic rocks, and 
to the east, south, and south-west by the carboniferous strata of 
Tyrone and Fermanagh. The lower beds of the latter series are 
usually unconformable to the brownish red sandstone and con- 
glomerate of the system beneath. The second district of red 
sandstone described by Mr. Griffith forms a narrow ridge, known 
as the Curlew Mountains, and extends from Drumshambo, at 
the foot of Lough Allen, County Leitrim, in a western direction, 
by Moygara to Mullaghanoe Hill, in the county of Sligo, a dis- 
