36 



NEW YORK STATE MUSEUM 



mountains to the west\vard. It outcrops in typical development at 

 Split Rock falls, where in the cascades of the Boquet it is well 



ft ^t>t, 



Fig. 5 Two inclusions of aaorthosite ia Split Rock Falls type, a: Split Rock falls 



exposed. The rock is suggestive of the anorthosites in that blue 

 labradorite is the chief feldspar present, but the dark sihcates are 

 more abundant and when crushed and sheared the rock \-ields a 

 decidedly foliated gneiss. It then becomes a hard dense rock, ex- 

 tremely tough. Nevertheless, large phenocr^sts of labradorite are 



