Vol. 65.] OVERTHRTJSXS AT TINTAGEL. 277 



there beds so low in the series as are here exposed. West of the 

 Elephant Rock the Barras Nose Beds and volcanic rocks compose 

 the cliffs, and they are succeeded by the Trambley Cove Beds and 

 Tredorn Phyllites of Willapark and Lye Rock. North of the bay, 

 along the Trevalga cliffs, the same sequence is found. Inland 

 excellent sections of the Woolgarden Phyllites are supplied by the 

 numerous crags of bare rock in the Rocky Valley and St. Nectan's 

 Kieve (east of and off the map, PI. XIII). 



Trevena Valley. 



The beds occurring in Trevena Yalley have been partly described 

 in the account of fig. 3 (p. 270) ; but no localities were mentioned 

 where the several types can be studied. 



Most of Trevena village is erected upon volcanic rocks, which are 

 exposed in the cuttings beside the road to the Vicarage. Opposite 

 the Vicarage gateway a wall is built, partly on volcanic and 

 partly on the overlying Trambley Cove Beds, and a small cliff of 

 Trambley Cove Beds runs through the Vicarage garden. 



The road leading from the village to the sea-road is flanked on 

 the north by lava and Trambley Cove Beds; and their junction may 

 also be seen in a yard behind the last house but one of the village, 

 where the Hotel road turns off to the right. 



The valley between the Stepping Stones and Castle Cottage is 

 cut through the volcanic rock, Barras Nose Beds, and Woolgarden 

 Phyllite, and the prominent ridge caused by the hard gritty Barras 

 Nose Beds can be traced from the Stepping Stones to the Hotel 

 stables on the eastern side and to near the Keep on the western 

 side of the valley. 



The syncline and anticline of this valley have been described 

 on p. 271. 



Trevalga Cliff's. 



Little need be said of these cliffs, as the succession of rocks is 

 normal, and constitutes the seaward termination of the main de- 

 velopment of the beds. The different degrees of hardness of the 

 rocks are accountable for the varied scenery of this piece of coast. 

 Prom Trewethet the precipitous cliffs of lava terminate at Trambley 

 Cove, where blue-black slates overlie the lava and form the ridge of 

 islets known as Saddle Rocks. North of the Saddle Rocks, Long 

 Island stands out as a pyramidal mass, while Short Island and 

 Grower reveal the tendency of the Tredorn Phyllites to weather 

 along joints into sea-stacks. Veins of quartz and alb ite- felspar 

 traverse the Tredorn Beds at Fire Beacon, and beautiful specimens 

 can here be collected. Possils, chiefly Spirifer vemeuili, are also 

 common at this locality. Looking southwards from Trewethet Gut 

 the cliffs ot Woolgarden Phyllites and Barras Nose Beds are seen, 

 and a vein of quartz and schorl here cuts across the strike of the beds. 

 This locality is over 5 miles distant from the Bodmin Moor Granite. 



Q. J. G. S. No. 259. tr 



