262 MR. GARDINER AND PROF, REYNOLDS ON {May 1902, 
little comment: broken felspar-crystals and lava-fragments, chiefly 
andesitic, are plentiful; in some cases the sections are freely 
traversed by veins of granular quartz, and the fine matrix sur— 
rounding the fragments is considerably silicified. 
(4) Coarse green ash.—This is a very well-marked rock, and. 
proved of much use in correlating and grouping the exposures in the - 
three limbs of the great fold. In the southern limb it is seen at 
Foilclea (A 2); in the middle limb it occurs along the northern slopes. 
of Clogher Head (B 2); and in the northern limb it is seen at Foilwee 
(C3). Similar green ashes occur west of the Penitential Station 
(A 15), and east of Carrigard (B9). In a hand-specimen, these 
rocks show a pale-green groundmass, full of irregular dark-green 
fragments commonly less than three-quarters of an inch in length, 
which, under the microscope, are seen to consist of crystalline 
rocks. While, however, some of the fragments are rhyolitic, the 
great majority are of andesitic type, and bear no very close resem- 
blance to any of the local rocks. 
(5) Very coarse ashy conglomerate or breccia.—tThis 
rock, probably the most remarkable of any exposed in the inlir, 1s. 
met with only in the southernmost of the three limbs, being seen at 
the point south of Redcliff Cove, whence it can be followed inland 
to the neighbourhood of the Stone Cross. 
The blocks which form this remarkable deposit consist chiefly of 
local rhyolites, and are sometimes rounded, sometimes angular in. 
outline. The fine-grained material filling up the spaces between » 
the fragments is sandy in character, and sometimes contains. 
fossils. 
(c) The Intrusives. 
The ‘intrusive rocks of the district occur mainly in the form of 
sills, but include one dyke. ‘They are of three types, namely, ‘green- 
stone,’ labradorite-porphyrite, and quartz-porphyry. 
(1) The greenstones.—Greenstone-sills occur at Mill Cove, 
at Redcliff Cove, where the rock can be followed inland to the 
neighbourhood of the Penitential Station on the northern side of 
Clogher Head, and at the base of the peninsula of Foilwee. The 
last-named sill appears to be given off from a small boss seen in 
the inlet of Coosaneal. ‘These rocks are all in a very poor state of 
preservation, and it is difficult to obtain any reliable evidence as to 
their original character, though perhaps the Redcliff-Cove rock was 
originally an enstatite-porphyrite or andesite. 
The groundmass is very fine-grained, and usually contains much 
epidote and ilmenite. The ilmenite may, or may not, be altered 
into leucoxene. The epidote is sometimes, as in the Clogher-Head 
rock, aggregated in approximately parallel bands. In almost every 
case the groundmass shows felspar-laths, which, in the case of 
the Clogher-Head rock, give a maximum extinction-angle of 8°. 
