76 ME. E. N. WOETH ON" THE IGrNEOUS CONSTITUENTS OF THE 



11. Porphyritic vein-stone, with Murchisonite, decayed felspars and 



schorl. Exminster. (Possibly associated with andesite.) 



12. Pine-grained grey felsitic rock, with quartz-blebs, porphyritic 



felspars, kaolinized felspar-granules, fine mica, and acicular 

 schorl. Exminster. 



13. Grey granular felsite, with quartz, mica, and schorl. Exmin- 

 ster. 



14. Quartz-felspar-schorl rock. Heavitree. 



15. Schorlaceous felsite. Eed compact base with small porphyritic 

 felspars, quartz-blebs, mica, and patches of blue radiating 

 schorl — a beautiful microscopic object. Teignmouth. 



16. Eeddish felsite with dots and nests of schorl, bluish-grey and 

 radiating. The microscope reveals the existence of radial 

 structure in the ground-mass, apart from the schorl. Teign- 

 mouth. 



17. Schorlaceous felstone, with more prominent porphyritic felspars, 

 nests of schorl-needles, and some porphyritic quartz. Teign- 

 mouth. 



18. Schorlaceous felsite ranging from fairly compact to granular ; 

 long felspar-crystals, quartz-blebs, decayed mica-clusters, light 

 spotty schorl. Teignmouth. 



19. Eock with an andesitic rather than a felsitic look, but contain- 



ing occasional needles of schorl. Teignmouth. 



III. Andesitic Geoup. 



I class under this head the various examples of " felspathic 

 traps " which, like those in situ, range between andesites and basalts, 

 but are chiefly of the former class. They are found in the breccias 

 and conglomerates more or less plentifully throughout the district 

 under review, and in many cases present no distinctive characters 

 from some of the varieties in situ. Nor is the range of variation 

 greater in the one than in the other. The chief point to notice is 

 the frequent kaolinization of the felspars in these fragments, which, 

 in the case of the rocks with felted texture, gives them a curious 

 speckled mosaic aspect. 



1. Pine-grained greyish-red or reddish-grey mica-andesite. Tor- 



bay. 



2. Ditto, but quartzose and slightly open-textured, suggestive of a 



rock intermediate with a felsite. Torbay. 



3. Pted-grey speckled, felted andesite, with porphyritic vein con- 



taining Murchisonite. Teignmouth. 



4. Pine-textured andesitic rock, with acicular or felted base ; red, 



speckled with grey and spotted with black (? iron-oxide) and 

 containing kaolinized lath-felspars. Traversed by a porphyritic 

 felsitic vein, having a red compact subvitreous base, with 

 porphjadtic quartz and felspars, and some mica. Exminster. 



5. Pine-grained speckled variety, closely resembling sandstone. 



Exminster. 



