250 



VESICULAR GREENSTONE. 



Upper 

 Gallery. 



Wall-cases 

 6 and 7. 



among the fossiliferous slates of the district. Endellyon 



Cornwall. 



223. 



) 



An- 



other variety. These varieties are often employed as build- 

 ing stones. — Endellyon, Cornwall. (See " Report on Geology 

 of Cornwall, p. 88.) 



224. 



Vesicular trappean rock 



), crosses 



the village in a north-east and south-west line ; becomes 

 schistose towards the north-east. Is traversed by veins of 

 quartz in some places. — Tintagell, Cornwall. 



225. — Vesicular trappean rock. — Part of a trappean 

 mass, which extends from near Burlarroc to Lower Croan. 

 The northern parts of the mass are vesicular, and the 

 southern more compact. In the coppice (see Geological 

 Map 30) the rock is quarried for road-stone. It is the 

 same kind of rock so much prized and so well known to the 

 South Devon farmers by the name of honeycombe dun. 

 Near St. Mabyn, Cornwall. 



Vesicular trappean rock (greenstone). Forms 



part of a large mass, apparently intruded among the adjoin- 

 ing slates, which varies in composition from very compact 

 greenstone to this kind of vesicular trap. — Pentire Point, 

 Padstow Harbour, Cornwall. 



227.— Trappean rock {greenstone) in a decomposing 

 state.— Porthleven, near St. Breague, Cornwall. 



226. 



228. 



Vesicular trappean 



Mullion 



(greenstone.) — Bellu- 



VOLCANIC JRAPPEAN ROCKS, ASH-BEDS, AND CINDERS, from 



re - (See "Report on Geology of 



Devonsh 



) 



229. — Compact trappean rock {with ash). (S 



port on Geology of Cornwall," p. 121.) 



230. 



earth and calc spar. — Brent Tor. 



(greenstone). 





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