GEOLOGY OF THE LONG LAKE QUADRANGLE 515 



4 Augite syenite (harzose), by N. Y. C. & H. R. Railroad. 3^ 

 miles north of Tupper Lake Junction. Op. cit. p.rdp. 



5 Augite syenite (pulaskose), Loon lake, Franklin co. Geol. Soc. 

 Am. Bui. 10:177—92. 



6 Augite syenite, near Harrisville, Diana, Lewis co. C. H. 

 Smyth jr, Geol. Soc. Am. Bui. 6:271-74. 



7 Augite syenite (toscanose) , Little Falls, Herkimer co. Op. cit. 

 p. r69. 



8 Quartz syenite (toscanose), N. Y. & Ottawa Railroad. 2| miles 

 south of Willis pond, Altamont, Franklin co. Op. cit. p. r69. 



All analyses except 2 and 6 by E. W. Morley. 



This series of analyses gives an excellent representation of the 

 amount of differentiation in the Tupper syenite bathylith. To be 

 sure analyses 2,5,6 and 7 are from rocks from other localities, but 

 5, 6 and 7 are representative of the normal character of the rock 

 at all localities, at Tupper lake as well as at other points, and 2 is a 

 distinct intermediate stage between i and 3 which could certainly 

 be duplicated there. These are all green syenites; anatyses of the 

 red syenites will follow. Only analyses of the red granitic phases 

 fail. 



Of the six analyses which are suf!icienliy complete to enable 

 the placing of the rock in the new system, it will be seen that four 

 are persalanes and two dosalanes, that five different orders are 

 represented and five different subrangs, altogether showing a 

 large amount of differentiation for a bathylith of no great size. 

 While it is possible that somewhat more acid phases may be present 

 it is held to be very unlikely that any of the rocks of the bathylith 

 run over 70% of silica. 



It is to be noted that all of the rock has experienced consider- 

 able metamorphism, having a granular structure which has been 

 produced by mashing and recrystallization, and that the original 

 structure was granitic and somewhat porphyritic. The rock of 

 analysis i would therefore be properly described as a hornblendic 

 pyroxene-granophyro-andose. 



The rock of analysis 3 is from a large dike of syenite which cuts 

 gabbroid anorthosite. It is a granular, quite porphyritic rock 

 composed of microperthite, augite, hornblende, garnet, magne- 

 tite and quartz, the garnet and quartz mainly in corrosion rims 

 between the magnetite and feldspar. Its norm is as follows: 



