72 REPORT—1857. 
Feet. 
Hovonian. 22 Dingle beds .°- 2°. 92 ML See se ORe 
“| 4. Glengariff grits. . . . . «+. 6000 
aansition. a. bilestones! "°°, she Melere! se aeemUe 
Silurian FF Rardlow racks) 2°57 F290 Sa 
pa he AVVEDIOCKSEOEKS! 5 os Sate tet eee ite 
There are now two anomalous localities to be noticed :—1st. East of Dingle Har- 
bour, at Coosathurig, near Bull Head, some rocks consisting of red and green grits 
and slates, often caleareous, make their appearance, containing many common Wen- 
lock fossils, such as Halysites catenulatus, Atrypa reticularis, &c.* Over these 
is a good thickness of black slates, in which nothing but fragments of encrinite 
stems have been found. ‘These two sets of beds strike directly E.N.E. from Bull 
Head and Minard towards Cahirconree, and have on their northern side an equally 
straight parallel band of “ Dingle beds” dipping towards them, and as seen at two 
localities abutting against them, either brought against them by a fault, or by some 
curious and distorted unconformability. The second anomalous locality is north of Fer- 
riter’s Cove, between Ferviter’s Castle and Sibyl Head, where thick masses of pale 
salmon-coloured sandstone with some conglomerate appear to dip under the Wenlock 
rocks, and would therefore oceupy the place of the Llandovery sandstone, to which at 
first they were assigned. This assumption, however, involves the supposition of such 
enormous faults in other parts of the district, that it has been thought better to sup- 
pose them to be a slightly modified form of the group lying over the Ludlow rocks 
(that which represents the Tilestones), and brought down against the lower part of 
the Wenlock by a fault running through Smerwick Harbour about E.N.E. and W.S.W. 
Many faults are proved to exist in the district S. of Ferriter’s Cove, and one or two 
of great magnitude running E.N.E., or nearly so from that neighbourhood, across 
the Mount Brandon range parallel to the axes of the anticlinal and synclical curves 
mentioned before. Over the whole of these highly inclined and dislocated rocks 
sweeps another great mass of red sandstone and conglomerate, attaining in some 
places a thickness of more than 3000 feet, resting quite unconformably on everything 
below, but dipping quite conformably under the lower beds of the carboniferous lime- 
stone, wherever that formation is to be seen, namely, on the north about Castlegregory, 
on the north-east and east about Tralee, and on the south-east about Castlemain. 
Rising from underneath the lowland of the neighbourhood of Tralee and Castle Island, 
this undoubted Old Red Sandstone gradually swells up into a broad anticlinal ridge, 
the summit of which attains an elevation of 2700 feet in Baurtregaum and Cahirconree. 
Between those two eminences a deep glen has been eroded in it, known as Derrymore 
Glen, at the bottom of which grey slates and sandstones are formed, containing Upper 
Silurian fossils; and to the west of Cahirconree a broad longitudinal valley, which may 
be called that of Anascaul, has been eroded along the anticlinal axis of the Old Red 
Sandstone, in which valley can be seen the rocks previously mentioned as striking from 
Cahirconree to the coast at Minard. On the south side of this valley the Old Red 
Sandstone proper, resting unconformably on the lower rocks, contains a curious local 
conglomerate full of angular and rounded blocks of mica-schist, a rock not known in 
situ anywhere in the neighbourhood. It is 200 feet thick in Derrymore Glen, but 
thins out to six feet near Minard Head. This mica-schist conglomerate is not seen 
in the Old Red north of the Anascaul valley, where that rock forms a bold and strong 
unconformable capping to many of the hiils, and has several outlying patches forming 
the summits of peaks. One of these outlying patches also occurs on the south side, 
resting on Bull Head, within four miles of Dingle Harbour, being its furthest west 
extension on the south side of the promontory, while on the north side the Old Red 
Sandstone forms the capping of the ridge over Lough Anascaul, sweeps round Brandon 
Bay, forms Brandon Head, and runs off thence in a direct straight line for eighteen 
miles, dipping N.N.W. at 65°, and forming all the headlands that come within its 
beundary from Brandon Head to the northern Blasket Island. 
In the map of the promontory of Dingle, it may be likened to the broken crust of 
a pasty, through the fractures and holes of which the lower rocks become visible. It 
* Mr, Salter, from some fossils collected here, believes these beds to be lower than any seen 
at Ferriter’s Cove. 
