10 MR. R. D. DARBISHIRE ON GREAT-ORME^S-HEAD 



and occasionally at the bottom of tlie sea-cliffy on the west 

 side of the isthmus. It is apparently without traces of 

 shells. 



c. A chocolate-brown clay of close texture, with boulders 

 (some scratched) and seaworn pebbles distributed through- 

 out_, and occasionally, but very rarely, slightly bedded, 

 forms the general base of both eastern and western cliffs. 

 This bed was best seen on the beach and at the foot of the 

 low shore cliff in the eastern bay, where are now built the 

 new stone wall and boat-stairs opposite Ty-gwyn in Llan- 

 dudno. 



At this spot I have found characteristic fragments of 



Tellina solidula. Astarte arctica. 



Mactra solida. Cardium edule. 



The bed appears, but not so well marked, and not ex- 

 hibiting fragments of shells, at the foot of the western 

 cliff over the last-named and passing upwards into the 

 next-named bed. 



The local exposure of strata in the western cliff is very 

 various, and alters considerably, as each year exhibits a 

 fresh face or, under the influence of rain and wind, a fresh 

 disguise. Inch-measurements are of very trifling value. 



This third bed appears at the bottom of the ballast-cut- 

 ting behind Colwyn Station, four or five miles east of 

 Llandudno, under sandy clay and old beach-shingle. At 

 that place I found good fragments of Samava, Astarte 

 arctica, and Cardium edule. The Astarte is distinctly a 

 shell of Glacial age, and of common occurrence in the Moel 

 Tryfaen beds, near Caernarvon. 



d. Upon the brown clay is a very similar bed of lighter- 

 coloured, reddish, looser clay, with rounded and angular 

 stones. It is exposed on the western cliff to the thickness 

 of 20-30 feet, and in most of the superficial cuttings on 

 the isthmus, as at the brickfields and in the new road from 



