622 THE GEOLOGY OP MINNESOTA. 



[Gabbro. Gneiss. Greenstone. Amphybolyte. 



No. 985. GABBRO. 



S. W. % sec. 10, T. 63-9 W.; near the Kawishiwi river. 

 Ref. -Annual Report, xv, pages 352, 392. 



Meg. A fine-grained, yellowish-gray, granitoid rock. 



Mic. The section is too thick for study, but it shows a fine-grained gabbro 

 whose chief minerals are plagioclase, diallage and magnetite. 

 One section. 



Age. Cabotian. u. s. G. 



No. 986. GNEISS. 



N. W. % see. 20, T. 63-9 W.; north side of the Kawishiwi river. 

 Ref. Annual Report, xv, pages 352, 392. 



Meg. A fine-grained, gray, granular rock. 



Mic. The section is of fine grain and the chief, minerals are quartz, feldspar, 

 hornblende and Motite. 

 One section. 

 Age. Probably Keewatin metamorphosed by Cabotian gabbro. u. s. G. 



No. 987. GREENSTONE. 



From the hill in sec. 18, T. 63-9 W.; north of the Kawishiwi river. 

 Ref. Annual Report, xv, pages 346, 347, 354, 392. 



Meg. One of the fine-grained, non-schistose greenstones. 



Mic. The section shows a greenstone composed largely of green hornblende 

 with some feldspathic material. In places there are indications that the feldspar in 

 part existed in small, scattered, lath-shaped forms. 



One section. 



Age. Keewatin. u. s. G. 



No. 988. AMPHYBOLYTE. 



From the summit of a small ridge between No. 987 and the shore of the Kawishiwi river. 

 Ref. Annual Report, xv, pages 346, 347, 392. 



Meg. A rather coarse-grained, dark-gray rock composed mainly of hornblende. 



Mic. The section shows large amounts of green, commonly fibrous hornblende, 

 with smaller amounts of fine-grained feldspar and perhaps also quartz. Biotite and 

 magnetite are also present. One section. 



Age. Keewatin. u. s. G. 



No. 989. GNEISS. 



N. W. J N. W. M sec. 27, T. 63-10 W.; south shore of the Kawishiwi river. 

 Ref. Annual Report, xv, pages 352, 392; Annual Report, xvii, pages 195, 206. 



Meg. A fine-grained, gray rock varying somewhat, but in general gneissic and 

 feldspathic. 



