58 REVIEWS 



C. K. Leith. " Moose Mountain Iron Range." Report of the Bureau of 



Mittes, IQ03, pp. 318-21. 



Leith describes the Moose Mountain iron range in the township of Hutton and 

 district of Nipissing. Iron formation consisting of magnetite, of banded magnetite 

 and quartz, and of magnetite, associated with amphibole and epidote, occurs in bands 

 and lenses in a complex of basic igneous rocks characterized by uniform abundance 

 of amphiboles. Some of the greenstones are basal and some intrusive into the iron- 

 bearing bands. Intrusive into the greenstone and probably into the iron formation 

 are granite masses. Closely associated with the iron formation, but with relations 

 unknown, is a pyritiferous graywacke. The ores and associated rock as a whole are 

 in general similar lithologically to the Vermilion iron-bearing district of Minnesota, 

 although showing many points of difference. 



Conwient. — Further field work in 1903 in adjacent areas indicates that a great 

 graywacke and conglomerate series rests unconformably against the rocks of the iron 

 range, thus adding another point of similarity of this range to the Vermilion iron 

 range of Minnesota. 



L. C. Graton. "Up and Down the Mississaga." Report of the Bureau of 



Mmes, Ontario, 1903, pp. 157-72, 



Graton reports on a geological reconnaissance along the Mississaga River and 

 east and west along Niven's baseline in the district of Algoma. Laurentian granites 

 occupy all of the area north of township 188, where was found a greenish slate con- 

 glomerate belonging to the Huronian. 



W. G. Miller. "Iron Ranges of Northern Ontario." Report of the Bureau 



of Mines, Ontario, 1903, pp. 304-17. 



Miller gives a resume of the occurrence of iron ore in northern Ontario, and 

 incidentally discusses their geological relations. 



A. P. Coleman. " Iron Ranges of Northwestern Ontario." Report of the 



Bureau of Mines, Ontario, 1902, pp. 128-51. 



Coleman gives results of an examination of the iron ranges of northwestern 

 Ontario, principally the Mattawan, Atikokan, Steep Rock Lake, and other districts 

 along the Canadian Northern Railway, the Slate Islands in Lake Superior, and near 

 Dryden on the Canadian Pacific. The description of the details of the districts 

 contains but few references to general stratigraphy and correlation, but at the end 

 a general classification of the iron ores of Canada is given. To the upper part of the 

 Lower Huronian (Archaean of the U. S. Geological Survey) are referred the siliceous 

 and sideritic iron ranges occurring in practically every iron-bearing area in Ontario, 

 but being mined at only one place, at the Helen mine in the Michipicoten district. 

 To the lower part of the Lower Huronian are referred the magnetite lenses in green 

 schists of the Atikokan district and the titaniferous magnetite, occurring as segrega- 

 tions in basic eruptives, especially gabbro. To the Grenville series " probably 

 Huronian " are referred the magnetite and hematite ores associated with bands of 

 crystalline limestone and gneiss of eastern Ontario. To the Animikie or Lower Huronian 

 (Upper Huronian of the U. S. Geological Survey) are referred impure siderite and 

 hematite occurring in the neighborhood of Thunder Bay and also near Algoma. To 

 the Pleistocene are referred the bog and lake ores and postglacial magnetic sands 

 occurring widely in Ontario and especially in the eastern part. 



