ASSOCIATED METAMORPHIC ROCKS OF THR LAKE-DISTRICT. 



15 



Fig. 2. — Sketch Map showing a part of the Boundary of the Butter- 

 mere and Ennerdale Syenitic Granite, and its Relation to the 

 neighbouring Rocks. (Scale 1 inch to a mile.) 



Tillar 



S. Syenitic granite. The rest as in fig. 1. 



even here, unaltered black slate occurs close to the junction. Near 

 Scale Porce the altered slate has quite a streaky appearance outside ; 

 and on the summit of Eed Pike, where only a small exposure occurs, 

 it is very hard and massive, approximating to the syenitic rock. On 

 either side of Ennerdale the slate is equally hard and Hint-like along 

 the junction and for some distance from it. 



The volcanic rocks in its neighbourhood are generally much 

 altered, being rendered very compact and flint-like ; but it is often 

 difficult, among these rocks in connexion with the syenite, to sepa- 

 rate metamorphic phases from those which are probably not strictly 

 dependent upon it ; but in no case have I seen any thing like the series 

 of changes described in Part II. as occurring around the granites of 

 Eskdale and Shap ; there are none of the purplish porphyrinic rocks 

 so generally found around these granites. 



