PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 165 



Diabase.] 



No. 85. DIABASE. ( Coarse. ) 



Two miles up French river. 

 Ref. Annual Report, ix, page 24. 



Meg. Considerably shattered and deeply decayed, but evidently one of the 

 heavier surface flows or sills of the region. 



Mic. A coarse ophitic structure is at once apparent. Olirine is only shown by 

 the usual independence of the areas that now are filled with the products of decay. 

 Magnetite, quartz, chlorite are conspicuous. 



One section. 



Age. Cabotian. N. H. w. 



No. 86. DIABASE. ( Amygdaloidal. ) 



French river, two miles from its mouth. 

 Kef. Annual Report, ix, page 24. 



Meg. A dark brownish, medium-grained diabasic rock containing a few small 

 amygdules of chalcedony and quartz. 

 No section. 



Age. Cabotian. u. s. o. 



No. 87. DIABASE. 



French river, three miles from its mouth. 

 Ref. Annual Report, ix, page 24. 



Meg. A fine-grained diabase with some black blotches, which are pseud-amyg- 

 dules of chlorite. 



Mic. Lath-shaped feldspars, aitglte, magnetite, hematite, chlorite and alteration 

 products. The chlorite forms pseud-amygdules. Probably some olivine was origi- 

 nally present. 



One very poor section. 



Age. Cabotian. u. s. G. 



No. 88. OLIVINE DIABASE. 



S. W. %, sec. 10. From the round point which bounds Sucker bay on the west. 

 Ref. Annual Report, ix, page 24. 



Meg. Pine-grained, dark and heavy trap. 



Mic. The feldspars are microlitic and ophitically embraced by the aiigite, 

 which in some cases encloses ten or fifteen of them. The olirine is in small grains 

 and much changed to a fibrous substance which is usually green, but which becomes 

 so charged with iron that it is also largely opaque. 



One section. 



Age. Cabotian. 



Remark. The coarse diabases Nos. 85 and 87, and the gabbroid characters of 

 No. 73, are believed to be due to the greater proximity, both areally and chronolog- 



