W. A. E. Ussher — Permian in Devonshire. 247 



which " may have been originally a shale or slate with some gritty 

 bands." ^ Mr. Harker could not have more precisely described the 

 cliffs at the north-east end of Slapton Sands, with whose shales or 

 slates I desired to connect the red mica-schist from the Start, had 

 he been intimately acquainted with the locality instead of being a 

 perfect stranger thereto. 



End of Part I. 



EXPLANATION OF PLATES VI. and VII. 

 Plate VI. 



Fig. 1.— Crystal of tourmaline in fine Devonian Sandstone, four chains south of 

 Beesands. (59) Magnified about 37 diameters. 



Fig. 2. — Crystal of tourmaline in quartz -schist, Start Farm. Formation of 

 secondary tourmaline with partial dislocation of same. (16) Mag- 

 nified about 37 diameters. 



Fig. 3. — Eectangular iron pyrites in fine Devonian Sandstone, north of Tinsey 

 Head. (5) Magnified about 18 diameters. 



Fig. 4. — Eectangular iron pyrites in siliceous band, South of Hope Headland. 

 (52) Magnified about 18 diameters. 



Plate VII. 



Fig. 1. — Quartz -schist, Start Farm. Eemnants of original quartz grains. 



(Compare " Grain of Quartz-sand in the Mica-schist of Arroquhar." 



Presidential Address of Dr. Sorby, F.E.S., Proc. Geol. Soc. 1880, 



p. 86, Fig. 9.) Magnified about 12 diameters. 

 Fig. 2. Fine Devonian Sandstone, north of Tinsey Head, with schist-like alinea- 



tion of iron ores and greenish mica. Magnified about 12 diameters. 



I am much indebted to my friend Mr. W. M. Baynes, of Torquay, 

 for valuable assistance in the preparation of my photographs for 

 publication. 



(To he continued.) 



II. — Permian in Devonshire. 



By W. A. E. Ussher, F.G.S., etc. 



(By permission of the Director- General of the Geological Survey.) 



1 N the course of a visit to the Hunsruck district between Treves 

 J and Bingen in the spring of 1890, in company with Professor 

 Gosselet, Mons. C. Barrois, Herr von Reinach and Herr Grebe, I 

 was struck by the resemblance displayed by the Permian quartz 

 porphyry of the valley of the Nahe, between Birkenfeld and Bingen, 

 to fragments contained in the breccias of Teignmouth. In discussing 

 the South Devon section with the two gentlemen last named, on 

 that occasion, they both gave it as their opinion that the lower beds 

 of the Devon section might prove to be representatives of the 

 Eothliegende. 



In the pressure of other geological work, I had no time to carry 

 the matter further, until May, 1891, when Herr von Eeinach spent 

 a week with me in examining the South Devon coast section and the 

 eruptive rocks in the vicinity of Exeter and Crediton. He then 

 expressed the opinion that certain parts of the lower New Eed rocks 

 of Devon corresponded very closely with members of the German 

 Permian, but that this correspondence was not borne out in con- 

 1 Appendix, Slide 24. 



