DRIFTS OP THE VALE OE CLWYD. 81 



generally well exposed, being kept clear of talus by the river, which 

 sweeps the foot of the cliff. (See section, fig. 3.) 



Here bands of reddish clay occur within the mass, and a red 

 boulder-clay comes on above on the east and south. 



It is excavated for brickmaking near the railway, a little north of 

 the station of St. Asaph, and again close to the line where the rail- 

 way crosses the road to Llanerch farm-buildings. This clay seems 

 to thicken to the south. In the well at Llanerch it was proved to 

 37 feet 6 inches ; while at Maeselwy, in the well, it was found to be 

 54 feet 10 inches in thickness. The boulders were chiefly at the 

 base. 



Fig. 3. — Section seen in East Bank of the Elwy below the Mount, 

 . ' St. Asaph. (Scale 80 feet to 1 inch.) 



a. Surface wash. 



b. Alternations of sand, with brown or red clay and loam ; varies much from 

 year to year, as the river cuts back the cliff. The middle part is, in general, 

 distinctly banded with even-bedded sand and loam ; contains flint, granite, and 

 sea-shells ; scratched stones not common. 



c. Blue clay, with many scratched stones ; all from Welsh hills (except some 

 stones from b, which have got into the top puddled and re-sorted part). 



On the eastern side of the tongue of drift that parts the Clwyd 

 and the Elwy at St. Asaph, opposite Bronwylfa, on the south, there 

 is a pit showing a similar section in the St. Asaph Drift. Here it 

 is chiefly sand, for which the pit was dug. I have found a few 

 fragmentary sea-shells in it. 



On the west side also of the vallev a similar drift is seen. In the 

 road-cuttiug opposite Y Eoe there is a red clay with shells and 

 boulders. Up the road towards Wigfair Uchaf red sand and clay is 

 excavated here and there. East of Efynonfair Chapel, just below 

 the bend of the road where it leaves the cliff, and about \ mile south 

 of Glanllyn, there is a section, the upper part, at least, of which must 

 be referred to the St.Asaph Drift. 



On top in the road-cutting there is a kind of rain-wash brick-earth ft. in. 



full of nests of wild bees 8 0 



Below this is a reddish boulder-clay 25 0 



which rests on a red sand 25 0 



and that on greyish boulder-clay, some stained red ? 35 0 



Q. J. Gr. S. No. 169. g 



