ASSOCIATED ROCKS OF THE LIZARD DISTRICT. 



899 



Cadgwith village to the level of the main plateau above the sea, we 

 again find the serpentine. A quarry here (in 1876) showed the 

 junction with the schist very well. The former rock overlay the 

 latter (which had a dip of some 30°) with a rather irregular junc- 

 tion ; but here, as in other cases, it seems to have generally forced 

 its way fairly evenly along the plane of bedding. The serpentine 

 (no. 6) is very compact in texture, and varies from a claret-colour 

 to an olive green, both varieties being veined and mottled, the 

 former with dull green and bright red, the latter with a purplish 

 tint ; occasional layers of greyish-green steatite occur. 



The serpentine in the cove beyond is mottled light and dark 

 green. This rock now continues to form the cliffs above the sea for 

 some distance. About half mile from Cadgwith (measured in a 

 straight line) the shore is strewn with huge boulders and overhung 

 by cliffs of a dark serpentine. This rock is almost as black and 

 compact as that of George Cove ; but the surface is varied by a vein- 

 like mottling of very dark olive-green, and by bronzite crystals 

 about 0*2 inch wide with a bright submetallic lustre (no. 10) ; it 

 weathers a dull earthy green. 



Some 100 yards from this spot, along the shore, we reached an 

 apparently faulted junction of the serpentine and hornblende schists. 

 Directly after, the serpentine sets in again, overlying the other rock, 

 following nearly the plane of bedding. The hornblende schist is 

 extremely altered ; some bands in it are in colour and texture very like 

 ordinary vein granite ; but, after most careful examination, I feel 

 convinced there is no true granite here. The ends of the strata are 

 bent over on the southern side ; and in the lower part a coarse 

 breccia of schist and serpentine separates the two masses of these 

 rocks. There is a similar breccia, though less irregular, on the 

 other side, where the base of the serpentine is greatly decomposed, 

 the rock assuming an earthy aspect, of a mottled dull greenish or 

 reddish grey colour, veined with indian-red, having scarce any re- 

 semblance to normal serpentine. A little further on are four 

 masses of hornblende schist, one after another along the shore, 

 caught up in the serpentine (fig. 5). Parts, again, of these are 



Fig. 5. — Masses of Hornblende Schist included in Serpentine. 



(The serpentine indicated by fine wavy lines.) 



b. Schist, bedding nearly vertical. c. Tongue of serpentine. 



d. Schist, bedding nearly horizontal, highly altered. 



