SCIENCE- GOSSIP. 



43 



Lit /■ ■us I'u sen* Lin. Lesser Black-backed Gull. I 

 have nut seen this bird often here, fcml ;i iVu everj 

 summer and winter. Ii is a resident, and breeds 

 in the neighbourhood. 



Larva marinus Lin. Great Black-backed Gull. 

 I have only seen this bird here i hree or four times, 



both in sum r and winter. It is stated to breed 



in the neighbourhood. 



Rissa tridactyla Lin. Kittiwake. Residenl and 

 breeds hen'; but I only observed ii this winter— 

 L899-1 900— when it has been in c msiderable 

 iiumbers. 



f'riri trail" Lin. Common Guillemot. I have 

 only seen i his bird once or twice. 



Fratercula aretioa Lin. Puffin. This bird ough.1 



to be c iiH'ii near Lynmoul h, as I he i ■ 



must suitable for its breeding haunts, bul we have 

 only observed ;i single dead specimen washed up 

 on i he beach. 



ColymbuH septentnonalis I. in. Redthroated 

 Diver. 1 have seen young birds of this species on 

 m'\ era] occasions. 



Hurl; llail.ir. L///I niinil Ii , 



May, L900. 



GEOLOGY AROUND BARMOUTH, 



By John H. Cooke, F.G.S., F.L.S. 



( "onclude I from p:ige 8.) 



A CLOSE examination of the Glacial evidences 

 ■£*- around the Mawddach, point unmistakably to 

 the conclusion that they are not due to the action 

 of one great ice sheet, but t'-iat Cader, the Arrans, 



the trend of the valleys — east, west, or south, as t In- 

 case might be. 



Among the many striae and groovings in liar- 

 mouth itself which will repay a visit are those 



Fig 2. — ICE-GROOvnrGS near Barmouth Church. 



and each of the more prominent peaks of the dis- 

 trict served as a centre from which were radiated 

 in all directions a number of ice sheets whose 

 directions were determined, to a great extent, by 

 the valleys which they tilled. As a rule the stria- 

 tions indicate a westerly movement of the ice ; but 

 local circumstances have in many cases modified 

 tins, and the direction of the glaciers conformed to 



situated near the new church. They are huge semi- 

 circular troughs, lying on a plane inclined at an 

 angle of 30°, and measuring 31 feet by 15 inches 

 and 38 feet by 8 inches. Their direction is north- 

 west by west. One of them is terminated by a 

 large pot-hole, and the other by the merging of 

 two -mailer grooves into the main one (fig. lM. A; 

 the top of the hill above Belle Vue is another fine 



c I 



