. Ontario Sessional Papers, 1914, e;^a but for the reasons just given ISudbury series or Sudbur-ian seems preferable. In a paper prepared for the recent Geological Congress on The Sudbury Seriesand its bearing on pre-Cambrian Classification, the writer has arranged the variousgroups of rocks found in the region, including Sudbury and the typical Huronian dis-trict as follows: a Eng. and Min. Journ., iSept. 30th, 1911, and Ontario Bureau of Mines, Vol. XIX, Part II. 206 Bureau of Mines No. 4 POST=LAURENTIAN PRE-LAURENTIAN Keweenawan (Mamainse, Nickel Eruptive, etc.) Disco7danceAnimikie
. Ontario Sessional Papers, 1914, e;^a but for the reasons just given ISudbury series or Sudbur-ian seems preferable. In a paper prepared for the recent Geological Congress on The Sudbury Seriesand its bearing on pre-Cambrian Classification, the writer has arranged the variousgroups of rocks found in the region, including Sudbury and the typical Huronian dis-trict as follows: a Eng. and Min. Journ., iSept. 30th, 1911, and Ontario Bureau of Mines, Vol. XIX, Part II. 206 Bureau of Mines No. 4 POST=LAURENTIAN PRE-LAURENTIAN Keweenawan (Mamainse, Nickel Eruptive, etc.) Disco7danceAnimikie (Sediments included in the Nickel Basin). DiscordanceUpper Huronian. Small DiscordanceLower Huronian. Great Discordance(Laurentian, in Eruptive Contact with Lower Rocks). Sudbury Series. Great Discordance(Granites Eruptive through the Keewatin).Keewatin, probably=Grenville Series. The Sudbury series, as here placed, was formed between two great periods ofmountain building followed by profound erosion and is therefore separated by a great. M oose Mountain Iron Mine lapse of time from the Keewatin below and the Huronian above. The subdivisions willbe taken up in the order of time, but the Sudbury series, as the most important newelement in the classification, will be described more fully than the others. The Keewatin Keewatin rocks occur in small amounts at several places in the Huronian region,but they have attracted little attention. In 1891 Alexander Winchell found that therewere older rocks included in the typical Huronian and suggested that they be calledKieewatin. The present writer observed bands of green and gray schist enclosed inthe Laurentian gneiss east of the basal conglomerate near Thessalon in 1899 and cameto the conclusion that if these rocks were found on the Lake of the Woods therewould be no hesitation in assigning them to the Keewatin. As a result of the visitof the International Committee in 1904 it was recommended that the green chloritic 8 Bull. Geol. Soc.
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