226 MR. GARDINER AND PROF, REYNOLDS ON [May 1902, 
14. The Fosstttrerous Sitvurtan Brps and AssoctatEpD IenzEovs 
Rocks of the CLogHER Heap Disrricr (Co. Kurry). By Coartzs 
Irvine Garpiner, Esq., M.A., F.G.8., and Prof. Sipnzy Huce 
Reynotps, M.A., F.G.8. (Read January 22nd, 1902.) 
[Puatrs VI—Map. | 
ConTENTs. 
Page 
te Introduction =-2...4- (aihiaalea'n a gncedt eines napslevia es eee ee 226 
IL. Detailed Description of the Exposures 727.0022. ,-ee- eee 22 
(a) The Coast-Section from Dunquin to Owen. 
(6) whe Coast-Section from Coosmore to Owen. 
(c) The Coast-Section from Coosmore to Cooselass. 
(d) The Western Side of Smerwick Harbour. 
(ec) Inland Exposures of Rhyolites and Ashes. 
(f) Inland Exposures of Sedimentaries. 
(1) The Neighbourhood of Dunquin, Coumaleague, 
and Croaghmarhin. 
(2) The Neighbourhood of Teeravane, Clogher, and 
Gortadoo. 
III. Correlation of the Exposures, and Conclusions as to the 
General Succession) .. ccc. oisciscescunieeiscdid sa eee 255 
T¥. Further Remarks on the Fossils +....0: .j.c-.2oc0sd-se= ee aeeen 257 
WV. Petrozgraphical Details «2. 2.d.cm. cosssdiee one bee eee eee 258 
(a) The Lavas. 
(b) The Ashes. 
(c) The Intrusives. 
VI. General Summary and Conclusions...................:eceeeseeed 263 
I, Iyrropvucrion. 
Tae area dealt with in this paper is situated in County Kerry, 
at the westernmost extremity of the Dingle promontory. The 
exposures are met with over an area measuring about 4 miles from 
north to south by 3 miles from east to west; but, owing to the great 
amount of peat and alluvium, the exposures inland are somewhat 
scanty, and one depends mainly on the magnificent coast-section for 
geological intormation. 
The area is one of great interest to a geologist, from the splendid 
development in it of acid volcanic rocks, associated with beds mainly 
of Wenlock age. Except at Tortworth in Gloucestershire, and 
probably in counties Mayo and Galway, it is in the Clogher-Head 
district alone in the British Isles that contemporaneous volcanic 
rocks of Silurian age are definitely known to occur. While, too, the 
Tortworth volcanics are basic or intermediate in character and arc 
mainly, if not entirely, of Llandovery age, in the Clogher-Head area 
the volcanic rocks are acid in character, and range throughout the 
Wenlock and up into the lower part of the Ludlow Series. 
Considering the number of interesting features shown, the area 
has been comparatively little described by geologists of recent 
years, but this is readily explicable owing to its remoteness and 
inaccessibility. 
The earliest reference to the geology of the district with which 
