REPORT OF THE DIRECTOR AND STATE GEOLOGIST 



r31 



Specimens 7 and 8, from the country just east of Canada lake, 

 are dark syenite or dioritic gneiss. No. 7 has streaks of quartz 

 running through it, parallel with the foliation (.see pi. 8, fig. b), 

 but no. 8 is quite massive and decidedly igneous in its appear- 

 ance. Xos. 16 and 17, from the southern portion of the town- 

 ship, are in strong contrast with 7 and 8. They are light col- 

 ored feldspathic gneisses, tightly compressed and finely foliated. 

 Streaks of biotite, apparently rubbed out by the shearing action, 

 run through them. Under the microscope no. 16 is seen to con- 

 sist chiefly of quartz, which is sometimes rolled out in thin 

 lenses and sometimes greatly granulated. Orthoclase and piagio- 

 clase are both present, and biotite appears in important amount. 



Johnston: n 



Johnstown is a large town which lies south of Bleecker 

 and Garoga. The great fault scarp which passes northward 

 from the " Noses," crosses the town from its southwestern 

 corner toward the northeast. About one third the area is pre- 

 Cambrian, and the remainder consists of the paleozoics. Heavy 

 drift lies on both and serves to conceal the outcrops. A second 

 fault that runs off through the town of Palatine meets the 

 " Xoses " fault and serves to bring the paleozoics to the surface 

 along the western border. 



Specimens 18 and 19, whose location is shown on the map, are 

 porphyritic or augen-gneisses, somewhat different from any men- 

 tioned elsewhere in this report; IS is a light colored feldspathic 

 variety, whose dark silicate is biotite. Quartz is fairly abundant 

 but is inferior in amount to the feldspar. Large crystals of red 

 orthoclase, which are in contrast with the light green of the 

 prevalent feldspar, are distributed through the rock. Xo. 19 is a 

 much more micaceous variety, but it still exhibits the porphyritic 

 crystals of feldspar. Xos. 11 and 15 were obtained from a 

 ridge of gneiss just east of Kecks Center. They are finely lami- 

 nated feldspathic gneiss, having apparently the general compo- 

 sition of granite. They have been greatly compressed and have 

 a close and extremely regular foliation. The strike is n 20 w 

 magnetic. 



