334 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .Mar. 7,
dip were steady for the whole distance. Possibly 900 feet would
not be far from the real thickness.
Proceeding up the Cork and Midleton trough to the westward,
the next most instructive section will be one drawn north and south
through Carrickshane, near the town of Midleton, to the Old Eed
Sandstone hills on the north.
Fig. 6. — /Section across Bilberry Hill.
B. Eoxborough
House. BUberry Hill.
dl c
Length of Section, 3^ miles,
.d'^. Thick-bedded grey limestone with fossils.
d^. Dark- grey slates with white and brown sand-
stones.
c. Old Eed Sandstone Eed slates with red and brown sandstones.
The thickness of the slates here is not exactly determinable, as
the exposures are few and scattered, and one of them gives a dip of
10° to the north, indicating an anticlinal curve. The quarries and
cuttings, however, which were opened at Bilberry Hill in the year
1851, when the late Edward Forbes visited this locality with me,
were crowded with the little eases of Crustacea which were then
called Cypris, since Cypridina, and are now known as Leperditia.
Forbes was greatly struck with these " Cypris-slates," as we then
called them, comparing them with those known on the continent as
Gypridina-schiefer.
The width of the tract at Bilberry Hill, in which grey and blue
slates and brownish and whitish sandstones are interposed between
the massive Carboniferous Limestones and the bright-red slates and
red and green sandstones of the Old Red Sandstone, is about a mile
and a half, but reference to our maps will show that there is a fault
as well as a curve in this tract. A list of the fossils collected in the
Carboniferous Limestone near Midleton, and those found in the grey
slates and grits of Bilberry Hill, drawn up by Mr. Baily, will be
found in the Explanation to sheet 187 of the Irish maps. The
limestone fossils include more than seventy species of Corals, Shells,
&c., such as are most abundant throughout the Carboniferous Lime-
stone of the British Islands. The fossils from the slates are fewer,
and I will therefore quote the list here : — Fenestella antiqua, Orthis
Michelini, Producta Martini, Bhynchonella pleurodon, Spirifera li-
neata, S. striata, 8. VerneuiUii (or disju7icta, with the variety called
Mosquensis), Aviculopecten nexilis, Cypricardia Phillipsii, Modiola
MacAdami, Orthoceras undulatum, Leperditia (^Cypridina) suhrecta.
The black slates and dark-grey grits strike steadily along the
south side of the Old Red Sandstone ridge from Bilberry Hill, through