592 THE GEOLOGY OF MINNESOTA. 



[Red shale. Jaspilyte. Green schist. 



No. 891. BED' SHALE. 



Stone mine, Soudan. 



Ref. Annual Report, xv, pages 253, 254, 388. 



Meg. A soft shale, at times finely banded. It varies from a greasy-feeling, 

 white material to soft, earthy hematite. 

 No section. 



Age. Keewatin. u. s. G. 



No. 892. JASPILYTE. 



North wall of Stone mine, Soudan. 



Ref. Annual Report, xv, pages 233, 256, 388; Annual Report, xvii, page 194. 



Meg. The usual gray, black and red banded jaspilyte, somewhat brecciated. 

 Mic. The sections show the ordinary jaspilyte, composed of iron ore and fine- 

 grained quartz. 

 Two sections. 



Age. Keewatin. u. s. G. 



No. 893. JASPILYTE. 



From a dark slaty crag in the South ridge, near Tower. 



Ref. Annual Report, xv, pages 224, 269; Bulletin vi, pages 230, 421. 



Meg. A gray to reddish-brown, slaty, non-banded jaspilyte. 

 M-ic. The section shows fine-grained quartz and iron ore (hematite and limonite) 

 with some greenish-yellow, earthy, staining material. 

 One section. 



Age. Keewatin. u. s. G. 



No. 894. GREEN SCHIST AND JASPILYTE. 



Near the railway cut in Ely mine, Soudan. 



Ref. Annual Report, xv, pages 224, 230, 388; Bulletin vi, pages 52, 230, 232, 421. 



Meg. A roughly schistose rock, composed of irregular bands and lens-shaped 

 masses of green, fine-grained schist and gray material which resembles the fine- 

 grained quartz of the jaspilytes. Considerable pyrite is present. 



Mic. The green parts of the section, the green schist of the hand sample, are 

 composed of closely matted fibres of chlorite; in some places a few grains of quartz 

 occur in the chlorite mass, and, on approaching the gray material, the jaspilyte of 

 the hand sample, the quartz increases in amount, usually occupying roughly lens- 

 shaped areas in the chlorite mass. The gray material is mainly fine-grained quartz, 

 with some flakes of chlorite. Pyrite and magnetite are common. One section. 



Age. Keewatin. u. s. G. 



No. 895. JASPILYTE. (Schistose.) 



Same place as No. 894. 



Ref. Annual Report, xv, pages 230, 388; Bulletin vi, pages 232, 421. 



