ON PHOTOGRAPHS OF GEOLOGICAL IKTEIJEST. 331 



Regd. No. 



323 Capel Curig (S.E.) . . Roche moutonnee 



32ft Cwm Tryfaen (W. side) . Large perched block, lying on glaciated sur- 

 face 

 325 Trefriew .... Glaciated rock-surface on "W. side of road 



Photographed hy Dr. Henry Stalterfoth, M.A., Chester. 

 Size 6x4 inches. 



353 Tremerchion, Vale of Exterior of bone caves in limestone ; Fynnon 

 Clwyd, 1890 Beiino and Cae Gwyn 



Photographed hy W. W. Watts, M.A., F.G.S., Geol. Survey of Ireland, 

 14 Hume Street, Buhlin. Unlargements from ^ plate. 



441 Welshpool, Quarry at . Dyke of columnar diabase 



442 Arenig, Railway Cutting . Boulder clay, with boulders 



443 Llyn-}--Gader, Cader Idris . Moraine dam 



451 ,, „ . Lake dammed by moraine 



444 Llyn-y-Cae (from N. side), Moraine dam 



Cader Idris 



445 Llyn-y-Cae (from E. side) Perched blocks 



Cader Idris 



446 Llyn-y-Cae (east of), Cader Roche moutonnee 



Idris 

 447,448 Llyn-y-Cae, Cader Idris . „ „ and perched blocks 



449 Y Foel Perfydd, Pen-y- Perched block (figured by Sir A. C. Ramsay) 



Gwryd 



450 Pass of Llanberis, below Glacial moraines (described by Sir A. C. 



mouth of Cwm Glas Ramsay) 



Per G. H. Morton, F.G.S., 209 Edge Lane, Liverpool. (Photographed hy 

 the late W. H. WiLSOX, (f the Liverpool Geological Society.) Size 

 12 X 10 inches. 



550 Llangollen, Tan-y-Castell Carboniferous limestone 



Ravine, Eglwyseg Rocks, 

 1876 



551 Llangollen, Craig-yr-ogof . ,, „ 



552 Llangollen, Ty-nant Ravine, Carboniferous limestone 



facing Craig-yr-Ogof on 

 the Nortli (Panoramic 

 view, 20 X 4^ inches) 

 [Showing the subdivisions of the Carboniferous limestone series, described by 

 Mr. Morton in ' Proc. Liverpool Geol. Soc.,' Vol. III., 187G.] 



Photographed hy J. J. Cole, F.B.A.S., ' Mayland,' Sutton, Surrey. 



586 Llanberis Pass . . . Altered rhyolites, lavas and tuffs 



587 Spur of Snowdon . . Ordovician slates, &c. 



588 Cwm Glas, Snowdon . . Glaciated hollow ; roche moutonnee 



SC0TL.\ND. 



Photographed hy John Stewart, 32 Boyd Street, Largs, Ayrshire. 

 Si~e 6x4 inches. 



348, 349 Ness Glen, Doon Water River erosion 

 (near Dalmellington). 

 1891 

 3 SO Loch Doon , . . Glaciated surface (rock basin) 



