ALMANDITE AND ITS SIGNIFICANCE 653 



THE SKARN ROCKS 



When this bed is followed along the strike for about 600 feet 

 it changes to a rock composed of: 



Per Cent 



Diopside \ 



Wollastonite / ^'^ 



Phlogopite few flakes 



Calcite 1 



Dolomite J ^^ 



Pyrrhotite 2 



Magnetite i 



After a short distance the bed comes under greater influence 

 of solutions from the bathoHth and changes over to a skarn rock 

 composed of: 



Per Cent 



Orthoclase 1 



Andesine J ^ 



Almandite 10 



Pyroxene 4 



Calcite \ 



Dolomite / 



Phlogopite I 



Magnetite \ 

 Pyrrhotite J 



At this point the bed passed beneath a thick cover of drift and 

 the more advanced stages, which are of chief interest in this discus- 

 sion, had to be studied in another locality where the succession was 

 more complete. The locality chosen was at Campbell's Dam near 

 Dalesville, where excavations had been carried on to some extent in 

 preparing the base for a waterwheel. At this point the limestone 

 was observed to change quite rapidly to a skarn rock containing 

 larger garnets in greater abundance than in the former locality. 

 Both the skarn rock and the garnets were analyzed and the re- 

 sults are reproduced below. 



