REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1900 r5o 



On the narrow gage, 1 mile from the station, is a cut in a red- 

 dish green, coarse rock (1044), with numerous feldspar augen and 

 with only a very rudely gneissoid structure, whose color is inter- 

 mediate between the usual green of the syenite and the red of the 

 granite, and which is quite typical of the augite granite into 

 which the syenite is elsewhere found grading. IJ miles farther, 

 a tremendous cliff of a red, hornblende granite (1040) rises close 

 by the track, the rock being more gneissoid than the previous, but 

 strongly resembling much of the granite which is found involved 

 with the syenite in the border zone. And f mile to the north, 

 just west of Little Pine pond; is another great vertical cliff (1041) 

 some 50 feet high, of a red granitic gneiss like the last. Here, 

 however, it is associated with low ridges of a somewhat 

 weathered, brown and greenish brown rock, which is certainly 

 referable to the augite syenite. The granite is likely the later 

 granite, though no contact was seen. 



Just north of these exposures, along the road fromi the station 

 to Lake Marian, outcrops of either syenite or granite, both the 

 granitic phase of the syenite and the later granite being present, 

 occur with more or less frequency for the first 3 miles from the 

 depot. Then the rock changes to interbanded red gneisses and 

 amphibolites, similar to those seen about horseshoe pond. About 

 Lake Marian is a mass of very interesting rocks. Along the north 

 ehore are very basic, easily disintegrating, schistose rocks, some 

 of which are slightly feldspathic, but most of which are wholly 

 made up of a light green diopside, colorless in thin section, and a 

 light brown mica which is in all probability phlogopite. Both 

 these minerals are quite characteristic of the Grenville rocks, and^ 

 though no limestone was seem, these rocks are unhesitatingly 

 referred to that series. With these are involved red and 

 black, and black and white banded gneisses. The former hold 

 much orange colored titanite along with biotite, hornblende and 

 feldspar, which is in great part microcline. But quartz is prac- 

 tically absent, though customarily present in large amount in 

 gneisses of this mineralogy. The black and white gneisse© also 

 hold considerable titanite, but of higher color and largely found 



