. A. H. Hunt — Devonian Roclis of South Devon. 345 



with being directly or indirectly the originators of whatever may be 

 of value in the foregoing pages. 



Parallelisms between the Devonian and Metamorphic Eocks. 

 Devonians. Metamorphic Eocks. 



} 



Micaceous sandstones 

 Micaceous slates 



Diabases \ 



Slates ) 

 Micaceous grit-hands in slates 



Micaceous quartz- schists \ 

 Mica- schists j 



Green Rochs ) 



Mica-schists ) 

 Micaceous quartz-schist bands in mica- 

 schist 



In grit-bands 



Quartz -grains with negative crystals 

 Quartz -grains with hair-like inclusions 



Detrital tourmaline 

 Ee-crystallized secondary tourmaline 

 White mica 



Ferruginous laminae with filmy mica 



Pyrites crystallized in cubes and prisms 



Hgematite cementing cracks. 



Black granules, magnetite (?) 



Diabase \ 



Schistose diabase ) 



In Diabase 



Secondary quartz 



Compact hornblende 



Fibrous hornblende 



Felspar 



Epidote 



Two chlorites 



Iron ores 



Veins in slates 

 Felspar 

 Quartz 

 Chlorite 



In quartz-schists 



Quartz-grains with negative crystals 

 Quartz-grains with hair-like inclusions 



Detrital tourmaline 

 Ee-crystallized secondary tourmaline 

 White mica 



Streaks of iron with filmy mica 



Pyrites crystallized in cubes and prisms^ 



HaBmatite cementing cracks 



Illack granules, magnetite (?) 



Compact Green Bocks \ 

 Green schists ) 



In Green Rocks 

 Secondary quartz 

 Compact hornblende 

 Fibrous hornblende 

 Felspar 

 Epidote 

 Two chlorites 

 Iron ores 



Veins in mica- schists. 

 Felspar 

 Quartz 

 Chlorite 



Calcite is abundant both in the Devonian and metamorphic rocks. 

 No comparison has been attempted owing to the uncertainty of its 

 origin. 



In the spring of last year Mr. Harker was kind enough to examine 

 eight specimens of the altered and unaltered rocks of South Devon, 

 lettered in three series, as they seemed to me to invite comparison. 



The following valuable notes were received by me on the 20th 

 May, 1891, accompanied by permission to make any use of them. 

 Although a far more complete set of rocks could now be selected for 

 comparison, the following have the unique advantage of having been 

 described at the outset of the investigation by a specialist, who, 

 besides having no detailed information about the mode of occurrence 

 of the specimens themselves, was not especially interested in the 

 problem of the schists of South Devon. 



In siliceous band south of Hope Headland. 



