ASSOCIATED METAMORPHIC ROCKS OF THE LAKE-DISTRICT. 11 



nite the same phenomena occur ; but on this side hornblende rock and 

 actinolite rock also appear." 



In 1858 Mr. J. G. Marshall* stated his conviction, as mentioned 

 in Appendix to Part II., that all the Lake-district granites were 

 " truly metamorphic rocks," the clay-slate and green-slate series 

 having "been generally subjected to the metamorphic action of heat, 

 pressure, and moisture." 



Prof. Harkness again writes on the Skiddaw-slate series in 1863 1 ; 

 and Prof. Phillips, in his article on the geology of the district for 

 Black's Guide, first published in 1846 and revised in 1865, speaks of 

 the gneiss and mica-schist surrounding the granite, and adds : — 

 " Above them appears a thick series of dark slaty rocks, very regu- 

 larly laminated and full of black spots of hornblende. This rock is 

 locally called ' whintin 9 and by geologists has been named * horn- 

 blende slate. 999 



The " hornblende rock " and " hornblende slate " thus alluded to 

 by Professors Harkness and Phillips are what, for reasons given in the 

 preceding pages, I have called spotted schist (German Knotenschiefer). 



Prof. Nicholson also mentions " chiastolite rock" resting " upon 

 hornblendic gneiss and, in some cases, mica-schist" J. 



EXPLANATION OF PLATE I. 



Fig. 1. Chiastolite slate, How Gill, Skiddaw. x 6. 



2. Spotted schist (Knotenschiefer), Skiddaw Forest. X 6. 



3. The same as fig. 2, viewed with polarized light. X 20. 



4. The same as fig. 2, viewed with polarized light ; a portion of the base 

 between the rectangular spots. X 50. 



5. Junction of Skiddaw granite and spotted mica-schist. The granite is on 

 the left, and the schist on the right. XlO, polarized light. 



These figures have been copied from drawings in water-colour made by the 

 author direct from the microscope. 



Part IV. — On tJie Quartz- Fel site, Syenitic, and associated Meta- 

 morphic Roclcs of the Lake-district. 



[Plate II.] 



Contents. 

 Introduction. 



I. Examination in the Field. 



1. St.-John's Quartz Felsite and surrounding rocks. 



2. Crag-Bridge Quartz Felsite. 



3. Butterraere and Ennerdale Syenitic Granite, and surrounding rocks. 



4. Carrock-Fell Eocks. 



a. Spherulitic Felsite of Carrock Fell and Great Lingy Hill. 



b. Diorite (?) of Miton Hill and Eound Knott. 



c. Hypersthenite of Mosedale Crags and Long Dale. 



* " On the Geology of the Lake-district, in reference especially to the Meta- 

 morphic and Igneous Bocks," Brit. Assoc. Rep. for 1858, Trans. Sect. p. 84. 

 t Quart. Journ. Geol. Soc. vol. xix. p. 113. 

 } ' Essay on the Geology of Cumberland and Westmoreland,' 1868. 



