8G 



Rocks of the Blue Ridge commencing at the western base at Turk's 



Gap. 



1. A light gray moderately fine-grained sandstone, met with near 

 the base of the gap, and extends up a third of the way to the top. 

 Dip steep to the S. E. 



2. A finer closer-grained rather bluish variety of the same, overly- 

 ing the former. 



3. A lead coloured argillaceous slate, slightly talcose, occupying 

 another third of the western side of the mountain. 



4. A dark-purplish gray and extremely close-textured indurated 

 sandstone, bearing evident marks of igneous action. This bed is not 

 thick. 



5. A schistose gray sandstone, rather argillaceous, with minute 

 specks of black sand, and little grains, the size of a pea of transpa- 

 rent amethystine quartz. 



G. A greenish-gray chloritic looking schistose sandstone. 



7. A fine-grained dark bluish-green argillaceous sandstone, full 

 of incipient crystallization in small vitreous specks, the size of 

 mustard seed. These specks are small amygdals, the exterior 

 being a semi-transparent yellowish-green matter like quartz, the 

 centre being black and granular. 



8. An argillaceous sandstone like the former, but containing 

 more crystalline specks, some of which are of an opaque pinkish- 

 white. 



9. Like the two former, the specks being better devolved, some of 

 these green and transparent, others pinkish-white, looking like anal- 

 cime. 



10. A very coarse, extremely hard sandstone, round grains of 

 semi-transparent quartz, in a coarse argillo-silicious paste, evidently 

 much indurated. 



11. A coarse-grained purple sandstone; the rounded gravel of 

 pink or amethyst coloured quartz, united by a dark paste. 



12. A gray purplish porphyritic looking conglomerate, of very 

 heterogeneous composition, green, red, white, &c. some felspar, 

 much quartz, and to appearance the matter of the green sandstones 

 of the ridge. 



13. A similar compound approaching to a brick red, angular 



