RfiSUME OF LITERATURE. 71 



the trend of the formations is stated to be more nearly east and west than 

 it had previouslj' been supposed to be. Hence the formations — 



cross the coast line at an acute angle, the later formations being- toward the south, 

 and the older along the international boundar_v line. . . . The formations that 

 compose the coast line" . . . seem to be something as follows, in descending order: 

 (1) Metamorphic shales, sandstones, and quartzite. These are cut b}' dikes, and are 

 interbedded with igneous rock. ... (2) Ferruginous and aluminous sandstones. 

 These seem to be metamorphosed into a firm basaltiform red rock, as seen in the 

 Palisades and at other points. ... (3) A quartzose conglomerate, seen at the Great 

 Palisades and Portage Baj' Island — probably more properly a part of No. 3. (i) The 

 quai'tzites and slates of Grand Portage Bay. . . . (.5) The jasper, flint, and iron- 

 bearing belt of Gunflint Lake and Vermilion Lake, and of the Mesabi range. (6) The 

 slates and schists which the Canadian geologists particularlj' designate Huronian. 

 (7) The syenites, granites, and other rocks that have been classed as Laurentian. (8) 

 The igneous rocks, known as the Cupriferous series [p. 10]. 



Of these, the only ones with which we are much concerned in the 

 Vermilion district are Nos. 4, 5, 6, 7, and 8. It is therefore of interest to 

 learn the relations of these to one another, as given in the report. 



Nos. 4, 5, 6, and 7 are probablj^ conformably arranged in succession; at least 

 the}^ have been so seen at places. Nos. i and 5 _ai"e closely associated, and perhaps 

 the latter is but a local phase of the former, while Nos. 6 and 7 are as closeh' related, 

 being conformablj' interbedded and stratified. No. .5 is conformable with No. 6 in 

 the iron district along the southeastern side of Vermilion Lake [p. 11]. 



WiNCHELL, N. H. Ninth Ann. Rept. Geol. and Nat. Hist. Survej' Minn., for 

 1880, 1881. 



That portion of this report containing a mention of the northeastern 

 part of the State is apparently merely the published field notes of the State 

 geologist. No attempt is made to reduce these notes to an orderl}- discus- 

 sion of the general geology, and the reader must g-lean such general facts 

 as he can find among the many details given. Thus, apropos of a specimen 

 taken from one of the beds, we learn that a greenish, schistose, porphyritic 

 rock, cut by veins of milky quartz, is found in nearly a vertical attitude 

 on Gunflint Lake. This is supposed to be the Canadian Huronian, and 

 underlies the quartzite and Gunflint beds, apparently unconformably 



«The northeast-southwest trending ooast line of Lake Superior is here meant. 



