in 



•: ; 



c 







'v 



V 



( 



•v 



i 









I 





,••*•• 



J 



y 



' 

 \ 



:■ 



1 





ELVAN AND GRANITE. 



239 



112. — Another variety of the above elvan dyke. Map 

 S3. — Herland Mine, Gwinnear, Cornwall. 



113. — Felspathic porphyry, (part of an elvan dyke,) 



cutting through granite. 

 Scilly Islands. 



Mary's, (near the Telegraph,) 



114. — Elvan, slightly conglomeratic, with decomposing 

 crystals of felspar, and associated with the slate of the 

 vicinity, which is seen to be fossiliferous near the 

 locality. Map 30. 

 bour, Cornwall. 



same 



Opposite Cant Hill, Padstow Har 



33. 



115.— Granitic vein, traversing altered slates. Map 



Mount 



116. — Sciiorlaceous granite, in contact with and 

 altering slates. The granite is line grained, and composed 



/ 



) Map 33— Mousehole 



felsp 



1 1 7.— Sciiorlaceous granite, composed of quartz, white 



a vein of fine- 



grained granite. (See "Report on Cornwall," p. 161.) 

 Round Rock Point, St. Martin's Bay, Scilly Islands. 



118.— Gran 



33. 



vein, traversing altered slates. Map 



Mount 



119. — Breccia, containing variously-sized angular frag- 

 ments of argillaceous slate. The cementing matter is some- 

 times slightly calcareous, and, the whole is traversed by 

 veins both of quartz and of carbonate of lime. (See "Report 



) Employed for roads and rough build- 



ing purposes. Map 

 Padstow, Cornwall. 



°0. 



South side of Dinas Hill, near 



TJPPHB 



Gailesy. 



"Wall-cases 

 6 and 7. 







: 



K 



