TEIASSIC BEECCIAS AND CONGLOMERATES OF SOUTH DEVON. 77 



6. Eed speckled base, with kaolinized porphyritic felspars. Ex- 



minster. 



7. Slightly amygdaloidal variety, granular base with quartz-blebs 



and porphyritic felspars. Suggests felsitic alliances, and pre- 

 sent aspect may be in part due to alteration. Exminster. 



8. Speckled variety, with blackish patches. 



9. Pelted audesitic porphyry, red - speckled, lined with white. 



Heavitree. 



10. Examples resembling rock of Eougemont and of other spots in 



the vicinity of Exeter. Heavitree. 



11. Loose-textured, dark-brown patches occur in the breccia at 



Exminster, which appear to be the remains of fragments of 

 decayed scoriaceous rock, like that of Thorverton or "Wash- 

 field. 



12. Eough-textured dark basaltic rock, closely resembling trap of 



Yeoton. Teignmouth. 



13. Loose-textured micaceous rock, closely resembling trap of 



Killerton. Teignmouth. 



14. Eock like vein in trap at Posbury. Teignmouth. 



ly. Miscellaneous. 



1. Quartz vein-stone. Exminster. 



2. Glossy quartz-vein-stone. Yeoton. (Both these are of Dart- 



moor character.) 



3. Schorl rock. Teignmouth, Exminster, Heavitree — in fact almost 



universally distributed. 



4. Schorl-vein-stones, some laminated. Exminster. 



5. Pelted schorl-rock, with porphyritic felspar. Exminster. 



6. Schorl-felspar-rock with scoriaceous aspect. Teignmouth. 



7. Eeddish-brown altered brecciated rock, with schopl- crystals. 



8. Veined schorl- and quartz-rock. 



9. Highly altered, consolidated, bluish-grey schist, traversed by 



numerous minute veins, some of which suggest cassiterite, now 

 very hard and compact. Teignmouth, Crediton. 



10. Altered slate, baked and partly veined by felsitic matter, 

 Crediton. 



Of these four classes of igneous and associated altered rocks, con- 

 taining in all 76 species or varieties, two (I. and lY.) can unhesi- 

 tatingly be assigned a Dartmoor origin in gross, and the same 

 remark applies to the schorlaceous division of II. The remaining 

 class. III., can with equal certainty be identified with or allied to 

 the in situ " felspathic traps " of the neighbourhood. 



We have thus to consider further only the non-schorlaceous 

 section of No. II., and here wo find the same characteristics ; the 

 bulk of the examples diff'er in no essential particular from Dartmoor 

 elvans, and in the majority of the cases are practically identical 

 with them. 



Of the residue, with but three exceptions, it may at once be said 

 that they belong to the same category, the only noteworthy distiuc- 



