A CONTRIBUTION TO THE GEOLOGY OF SOUTHERN MAINE 539 



of the quartz. The amount is so large that the analysis can be 

 classified as a whole rock, falling into the subrang I. 5. 1. 3, 

 phlegrose. Since the inclusions in these feldspars are of pre- 

 cisely the same type as those in other rock types of the region, 

 the conclusion seems justified that the inclusions described else- 

 where are of the same type. 



The high alkalies and low lime are noteworthy and correspond 

 with the absence of lime feldspar. This again is a general 

 characteristic of the igneous rocks of the whole region, lime 

 whether great or small in amount being invariably in a ferro- 

 magnesian mineral and nearly or quite lacking in the feldspar. 



Table VII. 



Analyses and Molecular Proportions of Monzonite from Spruce 

 Point, Me. 



I. 



II. 



Si0 2 



65-69% 



I-Q95 



55-95/. 



•933 



A1 2 3 



1S.54 



.181 



12.28 



.121 



Fe 2 2 



.66 



.004 



•25 



.002 



FeO 



■5° 



.007 



5.61 



.078 



MgO 



.12 



.003 



9.17 



1.48 



CaO 



•99 



.017 



4-6^ 



.082 



Na 2 



5-55 



.090 



1. 91 



.031 



K 2 



7-3o 



.078 



6.28 



.067 



H 2 + 



.OQ 





x8 





H 2 0- 



.OI 





•05 





TiO, 



•55 



.007 



3-i5 



.040 



C0 2 



none 





none 





P>O s 



•25 



.002 



■83 



.006 



Total 



100.26 





100.29 





I. "Augen" from monzonite of Spruce Point, Me. Position in the 



quantitative system, I. 5.1.3. Phlegrose. 

 II. Schistose ground-mass of monzonite from Spruce Point. Me. Position 

 in the quantitative system III. 5. 2. 2. Prowersose. 



Table VII. gives the analysis of the augen and also of the 

 ground-mass. The distribution of ingredients is evident with- 

 out especial comment. The potash is noteworthy, being high 

 in both parts and is of course in orthoclase in I and in biotite 

 in II. A more detailed description of the whole rock will be 

 given under monzonose. 



