RESEARCHES AMONG THE PALAEOZOIC ROCKS OF IRELAND. 135 
will be seldom wrong in recognising a group of rocks from their 
Stony characters. 
I have already described the Brandon Head section, and shown 
it to be Silurian; and I consider, as I have just said, the rocks of 
that section to be identical, in external character, with the rocks 
of many of the mountain ranges of Kerry, Cork, and Waterford; 
but, to show some of my reasons for so thinking more fully, I must 
go a little into detail. Alternations similar in character and colour 
with those in the Brandon Head section are observed about Derry - 
cunnihy, near the tunnel, on the road from Killarney to Kenmare, 
where bands of rock, brown and green, are crossed in travelling. 
So it is in the Boggra Mountains; a section occurs in the Fermoyle 
river, on the roadside from Kanturk to Cork, where alternate 
bands of green and brown grits and slates are found in succession. 
The cuttings in the railway from Mallow to Cork give a similar 
result, on the great scale; and on a smaller, I found the following 
succession in a piece of cutting, in the townland~ of Carrigduff, 
three miles south of Mallow, where every man may study it for 
himself. Beginning at the bridge, which is on the southern boun¬ 
dary of the townland, it is as follows, proceeding northwards:— 
From the bridge to entering the cutting, .... 40 yards. 
Brown slate,. 15 
Green flaggy grit, . 1 
Brown,. 5 
Green,. 5 
Brown,.3 
Green,. 1 
Brown,. 1 
Green,.8 
Pass 147J miles post. 
Brown, with green spots, ..19 
Green, ..8 
Brown, ..... . .. . 4 
Green, .. 4 
Brown,...* . . 3 
Green, . 4 
Brown slate,.6 
At this place a fault occurs, having brown slate on the south 
side, and green grit on the north. 
