RESUME OF LITERATURE. 67 



The agitation of tlie question of the organization of a geological survey 

 of Minnesota evidently had some effect, as is shown in the publication of 

 this report. Among other things, the State geologist reports that "speci- 

 mens of hematitic specular iron ore were obtained from a heavy deposit said 

 to lay between a lake forming the affluence of the Upper Embarrass River 

 and Vermillion Lake. The precise percentage of commercially pure iron 

 contained in this ore has not been ascertained" (p. 6). 



1866. 



Eames, Henry H. Report of the State geologist on the metalUferou.s region 

 bordering on Lake Superior. St. Paul, 1866; 23 pages. 



Eames gives merely a brief description of the then known metalliferous 

 rocks of northeastern Minnesota. He mentions the occurrence in the Ver- 

 million district of the siliceous arid talcose slates (p. 10) of Vermillion Lake, 

 in the last of which are found auriferous and argentiferous quartz veins and 

 the hematite iron ore (p. 1 1) of Vermillion Lake, which is associated with 

 quartzose jasperoids and serpentine rocks. 



Eames, Henry H. Geological reeonnoissance of the northern, middle, and 

 other counties of Minnesota. St. Paul, 1866; 58 pages. 



This contains the results of a geologic reconnaissance of the State. It 

 was found that the gi-anite uplifts have their greatest development in the 

 northeastern part of the State. They trend northeast, and reach their 

 greatest altitude at or near the Missabe heights. The most prevalent rocks 

 found in the northern part of the State are granite, porphyry, hornblendic 

 slates, siliceous slates, trap, greenstone, talcose slate, primitive schistose 

 rock, gneiss, and Potsdam sandstone. In the region occupied by these 

 rocks are found immense bodies of magnetitic and hematitic iron ore. In 

 the talcose slates and primitive schistose rock are veins of quartz, carrving 

 auriferous and argentiferous sulphides of iron and copper 



In a report by Richard M. Eames, assistant, a number of details of the 

 Vermilion Lake district, chiefly concerning veins, are given, and a geologic 

 map showing the outline of the formation siirrounding Vermilion Lake is 

 said to have been prepared and handed in, but does not accompany the 

 published report. 



