

240 



FELSPATHIC TRAP. 



Upper 

 Gallery. 



Wall-cases 

 6 and 7. 



Decomposed Granites.* 



120. — DFXo:.irosED granite, 



a 



hard variety. — Morley 



Clay Works, Dartmoor, Devon. Map 25. 



120a. — Decomposed granite, a white variety, with much 

 quartz and white felspar. — Morley Clay Works, Dartmoor 

 Devon. Map 25. 



121 and 122. — Decomposed granite, a white variety, with 

 much silvery mica. — Morley Clay Works, Dartmoor, Devon. 

 Map 25. 



123. — Decomposing felspatiiic trap. — Forth Hairoo- 



Ramsey Island, St. David's, Pembrokeshire. Map 40. 



124. — Felspatiiic porphyry (elvan). Map 78, N.W. 

 South of Hafod-onen, near Amlwch, Anglesea. 



125. — Felspathic porphyry (" elva 

 llwyd "). Map 78.— Llanfechell, Anglesea. 



') ( 



126.— Fink felspatiiic trap.— Near Lanark, Scotland. 

 127.— Felspathic trap. Map 60, S.E. — Dysgwylfa 



Owlbury, near 



Hill, near Bishops Castle, Salop. 



128. — Columnar felspatiiic trap. 

 Bishops Castle, Salop. 



129. — Light green felspathic trap, showing a white 

 weathered surface. — Tinnacarrig Hill, near New Ross, 

 Ireland. 



130. — Felspathic trap. Map 40. — Clegyr Bridge, St. 

 David's, Pembrokeshire. 



131.— Porphyritic rock, traversing red sandstone and 

 slates. (See " Report on Cornwall," p. 65.) Map 24. 

 Cawsand, Plymouth, Devon. 



* See " Report on Cornwall," pp. 509 to 513; also Mr. Hunt's De- 

 scriptive Guide, pp. 67, 63. Upwards of 60,00.) tons of china clay were 

 exported from Cornwall and Devon in 1855 : of these the btst quality is 

 used for making porcelain, while the inferior description is used* by 

 calico and paper makers. 





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