380 THE CRYSTAL FALLS IRON-BEAEING DISTRICT. 



northward; and in crossing the belt from the south to the north, after'passing the 

 middle, one traverses a repetition of the belts crossed farther south, but in an 

 inverted order. It would seem that we have to do here with a case of a synclinal, 

 whose sides are folded close together (p. 256). 



The relations of the Felch Mountain range to the rocks of the Menom- 

 inee River and the Marquette district are shown on a profile. The facts are 

 mentioned as having been derived from an unpublished manuscript report 

 (1881 to 1884) of Rominger to the Michigan geological survey.'^ 



Irving, R. D. On the classification of the early Cambrian and pre-Cambrian 

 formations. Seventh Ann. Rept. U. S. Geol. Survey, for 1885-86, Washington, 1888, 

 pp. 365-454. 



In this article the statements made above are repeated (p. 436). 



Van Hise, C. R. An attempt to harmonize some apparently conflicting views 

 of Lake Superior stratigraphy. Am. Jour. Sci., Vol. XLI, 1892, pp. 117-137. 



The author of this paper, after discussing the significance of the various 

 unconformities observed and after dividing the rocks of the Marquette dis- 

 trict into a Fundamental Complex and a Lower and an Upper series, attempts 

 to correlate the rocks of the Menominee region with these divisions. 



Passing now to the Menominee and Felch Mountain districts, our information is 

 less exact. It is, however, clear that in both of these areas we have the Fundamental 

 Complex — that is, the granites and the gneisses associated with crystalline schists 

 having the usual "eruptive contacts" — the equivalence in every respect of Lawson's 

 combined Laui'entian and Ooutchichiug i^eriod. Above this complex, Professor Pum- 

 pelly, with whom this whole subject has been discussed, and who has great famil- 

 iarity with the entire Lake Superior region, suggests as exceedingly j)robable that in 

 the Felch Mountain iron-bearing series only the equivalent of the Lower Marquette 

 occurs, the Upper series, if it once existed, having been removed by erosion (p. 133). 



1892. 



Van Hise, C. E. Correlation papers — Archean and Algonkian. Bull. U. S. 

 Geol. Survey, No. 86, Washington, 1882, pp. 549. 



In a summary of the literature on the Lake Superior region, the state- 

 ment quoted above is incorporated without change (p. 190). 



I Published iu 1895, Vol. V. 



