230 MR. GARDINER AND PROF. REYNOLDS oN _ [{ May 1902, 
Thickness in feet. 
A (26) Purple and dark-green rhyolite ......................5- u 
A (27) Calcareous fiags, with coral-layers, ashy at the base. 90 (seen) 
Fault. 
A (28) Compact rhyolite (ec). eee ee 80 
A (29) Calcareous flags and slates, with a few small bands 
0 ae 1d Penne SME 26. AON ERR sto osu oc 4 120 
A (30) Brown sandy slates, with green ashy conglomerate 
elOw AN se ee ere cn ee 40 
A (31) Caleareous flags, with coral-layers and bands of 
fairly coarse, ashy conglomerate......................0+ 65 
A(32) Thinly-bedded sandy slates 2.) -ep.2)..-00s-o eee 10 
A(33) ine purple ash ... 25.555. ea --cqeeen eee eee eee 12 
A(34) ‘Coarse purple ash: a) peies-00 en eee 120 
A(35) Kinely-banded rhyolite |...) 22.1..sn.-eeee ms perhaps 150 
Excluding the greenstones, this gives a thickness of 2680 feet. 
All along this strip of coast the amount of dip varies little from 
30°, the direction being generally about 30° E. of S., but varying 
shghtly. 
A (1). The junction between the Silurian and the overlying Dingle 
Beds is seen in the inlet of Cooshaun, immediately south of the 
village of Dunquin. The Dingle Beds are chiefly purple, micaceous, 
fine-grained grits, though some of them are green. Within some 
feet of the junction-line they show evidences of squeezing; and 
near the junction they are very much crushed, and become quite 
svapy to the touch. The underlying Silurian shows also some 
disturbance, and several small faults are seen in the cliffs of 
Cooshaun and Yellow Cove. The junction between the two sets of 
beds is therefore to be considered as a faulted one, despite the 
fact that both the Silurian and the Dingle Beds dip at the same 
angle to the south-east. 
That these underlying yellow strata (A 1) are Silurian is proved 
by their containing ‘ fucoid’-beds* a few feet below the Dingles, 
and crinoid-stems and Spirifer towards their base, and by their 
relation to the underlying beds. They are considerably disturbed and 
quartz-veined as one goes westward from Yellow Cove, and their dip, 
which was at first southerly, becomes more easterly ; towards their 
base they become distinctly ashy, and finally end in a bed of grey 
sandy limestone 11 feet thick. 
A(2). This limestone rests upon a bed of green ash (A 2), with 
numerous thin flakes of a dark-green rock, which is to be seen on 
both sides of the inlet, north of the point called Foilclea. There 
has been a certain amount of movement along the line of this 
green ash, which is seen to be crushed and squeezed in places. 
A(3). These red sandstones, with thin ash-bands, occupy the 
coast from Foilclea to Mill Cove, and have an approximate thickness 
of about 330 feet. Both at the northern end near Mill Cove, and at 
the southern end at Foilclea, the direction of dip is south 2U° east ; 
i The term ‘fucoid’ is used throughout the Geological Survey Memoir, in 
referring to the impressions seen in these Upper Wenlock Beds; they are more 
probably, however, worm-tracks (see Mem. Geol. Surv. Irel. 1863, Explan. 
Sheets 160, ete. p. 22). 
I 
f 
k 
J 
