170 Mr. Griffith, on the Order of Succession of the Older 
beds accumulate, the calcareous strata increase in thickness, 
and at length near the old Coppermine of Muckross, the slate 
beds entirely disappear, and the entire stratification con- 
sists of limestone, some beds of which are fossiliferous, and 
contain Producta depressa^ variety of the mountain limestone 
Spirifera bisulcata^ Spirifera resupinata^ and many of the other 
fossils which usually occur in the lower limestone. 
From Muckross mine the calcareous strata continue with- 
out interruption, dipping to the south at an angle of 40°, to 
the base of Turk mountain, a quarter of a mile to* the east of 
Turk cottage, and are still visible at the surface close to the 
line of the eastern continuation of the fault which is there con- 
cealed from view by diluvial matter. 
I have been thus particular in describing the strata visible 
on the north side of the fault at Brickeen Island and Muck- 
ross, as they present one of the most perfect sections which 
Ireland affords of the entire suite of the old red sandstone, 
the yellow sandstone, the carboniferous slate, and the lower 
carboniferous limestone, and which by their variety form a 
strong contrast with the uniform character of the chloritic 
quartzose strata visible on the south side of the fault, which 
strata evidently belong to the same series as those which oc- 
cur in a similar position at the Gap of Dunloe, and are in 
fact a continuation of the same strike. No doubt can there- 
fore be entertained that these inferior strata form the lower 
portion of the schistose series of the district to the south of 
Castlemaine Bay, that they are identical with the chloritic 
rocks of the Gap of Dunloe, and do not belong to the De- 
vonian as supposed by Mr. Hamilton 
Proceeding to the southward from Turk mountain, the suc- 
cession of rocks is similar to that already described as occur- 
ring above the chloritic beds of Dunloe: the strata undulate 
very much, and present several synclinal and anticlinal axes, 
so that the upper beds or reddish gray quartzose strata never 
appear on Turk or Mangerton mountains, and consequently 
in this line we do not meet wdth the old red sandstone strata 
till we approach the northern boundary of the valley of Ken- 
mare, where it occurs in a line parallel to that already noticed 
in describing the section betw^een the Gap of Dunloe and the 
valley of Kenrnare. It is true, Mr. Hamilton mentions the 
occurrence of old red sandstone in the centre of Mangerton 
mountain, but in that locality he may have mistaken the pur- 
* A section similar to that from the Gap of Dunloe to the summit of the 
Reeks may likewise be traced from the chloritic rocks, south of the fault 
at Brickeen Island, up to the old red sandstone on the summit of Glena 
mountain, as represented in Plate III. fig. 
