The Raised Beaches of Inishoweii. 279 



of which a fine section is seen close by on the bank of the 

 River Faughan. There, in descending order, we have 



feet 

 Bluish clay, • . . . ,1 



Yellowish clay, . . . . .1 



Stratified gravel, . . . . .8 



Very fine greyish sand . , . .20 



Water of river, at high tide level. 



This deposit is rather puzzling, but it is probably of glacial 

 age. 



Next morning I drove to Burnfoot, on the upper reaches of 

 lyough Swilly, and visited the brick-field there, which is 

 situated on an extensive flat of reclaimed land, slightly below 

 high water-mark. I had hoped that the material was estuarine 

 clay, but found it to be a fine hard pinkish clay, without 

 fossils, but containing layers of pebbles and boulders. Thence 

 I walked to Blanket Nook. The Geological Survey map 

 marks a raised beach fringing the alluvial flat for some miles 

 in this direction, but little was to be seen. According to the 

 Memoir this deposit has an average elevation of 32 feet. On 

 the northern shore of Blanket Nook, not far east of the rail- 

 way, a gravel bank, evidently a raised beach, rises to a height 

 of 20 feet above the muddy flat. No section was seen, but on 

 the surface I picked up Ostrea, Peden varius, Mytilus edtdis, 

 Cardiu7n edule, Tapes aureus, T decussatus, Mactra subtrtmcaia, 

 Littorina litorea, L. obtusata, Cerithiuvi reticulahi7n. Further 

 west is a striking deposit — a horizontally stratified bed at least 

 12 feet thick, consisting almost entirely of marine shells, 

 mostly unbroken, and in good preservation — apparently a 

 shelly bank laid down by currents at the entrance of the bay 

 when the land stood slightly lower than now, and evidently 

 newer than the before-mentioned raised beach, which runs 

 along behind it and above it to the entrance of the bay. The 

 top of the shell-bed is about 6 feet above high water-mark. 

 The species found here were as follow : — 



Anomia ephippiu7n. Tapes aureus. 



Ostrea edulis. T. decussaius, 



Pecten varius, T. virgineus. 



Mytilus edulis. T. pullastra. 



M* adriaticus. Vertus galli?ia. 



Cardium echifiatum* V. ovata. 



C exiguuvi* Tellifta balthica, 



C* edule. Mactra subtrtmcata. 



