^^^ MESSRS. A. HAKKEIl A^•U J. U. .MAKK UN 



EXPLANATION OF PLATES X., XI., & XIL 



Plate X. 

 Map illustrating the relations of the Shap Granite and associated rocks. 



{The figures are all drawn in natural light, and, exx-cpt PI. XII. fig. 5, 

 J magnified 20 diameter;?. The numbers in brackets [ ] refer to the slides.] 



are 



Plate XI. 



Fig. 1 [902]. Shap Fell granite, normal type ; showing clear quartz, turbid 

 felspar, and flakes of brown mica. A flake near the lower right-hand 

 edge contains a small zircon surrounded by a strongly pleochroic 

 border. 



Fig. 2 [391)]. Dark patch in Shap Fell granite ; showing quartz, felspar, and 

 mica, as before, but the last more plentiful ; also grains of sphene, 

 octahedra of ma^rnetite, and little needles of apatite. See p. 281. 



Fig. 3 [1281]. Special modification of Shap Fell granite, containing andalusite ; 

 not found in place. The portion of the slide figured is rich in anda- 

 lusite, which forms imperfect prismatic crystals, coated with brown 

 mica and enclosing magnetite, zii'con, mica. &c. Around some of the 

 inclusions, especially zircons, are pleochroic halos, changing from 

 bright yellow to colourless. The bulk of the rock is a mosaic of 

 felspar and quartz with abundant crystals of magnetite and occasional 

 apatite. See p. 283. 



Fig. 4 [1205]. Metamorphosed vesicular andesite, near Wasdale Pike, about 

 800 yards from the granite. The upper half shows a vein of chal- 

 cedony converted into quartz. The lower half shows a vesicle in 

 which the delessite (represented dark for distinctness) has been partly 

 replaced by green hornblende. The clear mineral in the lower part 

 of the vesicle is quartz. This rock represents an early stage of meta- 

 morphism. See p. 294. 

 Fig. 5 [897]. Metamorphosed vesicular andesite, Wasdale Pike, about 500 yards 

 from the granite ; showing the grouudmass of the rock converted into 

 a fine-grained aggregate of brown mica, felspar, quartz, and magnetite. 

 Witbin the vesicle is green hornblende instead of mica. A patch of 

 granular sphene is seen at the lower edge of the figure, on the line of 

 a small crack. See p. 296. 

 Fig.'G [1203]. Metamorphosed vesicular andesite, north of Wasdale Pike, 

 about 400 yai'ds from the granite ; showing an unusual type of altera- 

 tion, brown mica and felspar (in relatively large crystals) being formed 

 in tbe interior of the vesicles, as well as in the groundmass. See 

 p. 297. 



Plate XII. 



Fig. 1 [11()9]. Idocrase-garnet-i'ock in the metamorphosed Lower Coniston 

 Limestone, Wasdale Head, about 100 yards from the granite ; show- 

 ing dodecahedra of grossularite garnet embedded in ophitic crystals of 

 idocrase. Both minerals contain granular pyroxene and other matter, 

 and the idocrase encloses groups of small needle-like crystals. See 

 p. 311. 



Fig. 2 [909]. Ovoid nest of colourless lime-augite, bordered by a zone of felspar 

 crystals, in the metamorphosed Calcareous Breccia of the Upper 

 Coniston Limestone, Wasdale Head, about 250 yards from tbe granite. 

 Two quartz grains, of clastic origin, are seen in tbe lower part of the 

 figure. Flakes of brown mica cluster round these and round the 

 augite-felspar nest. See p. 314. 



Fig. 3 [1215J. Tremolite-rock in the metamorphosed Calcareous Breccia at the 

 same locality. See p. 314. 



