Identifier: annualreport191002onta (find matches)
Title: Annual report
Year: 1891 (1890s)
Authors: Ontario. Dept. of Mines
Subjects: Mines and mineral resources
Publisher: Toronto
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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on of the report, to adopt local namesfor the two well developed series of pre-Cambrian sedimentary rocks of the region.Since the relations of neither the one nor the other to the rocks of the classicHuronian area are definitely known, it was decided for the present, at least, not tomake use of the name Huronian. To the younger series that lie on the eroded surof the Lorrain granite and other rocks, and contain many veins of rich cobalt silveroies, the name Cobalt is applied in this report. To the older series of fragmentalrocks that are intruded by the Lorrain granite and are not of importance in the pro-ductive part of the cobalt-silver area, the name Temiskaming is given. This latterseries is described in preceding pages. ♦Gowganda Min. Div. Report No. 1075, Geo. Sur.. Can.tl&th Report, Orat. Bur. Mines, p. 275 ct seq.±Geo. Sur. Can. No. 1064. pp. 18, 20. § Report on Railway Trial Line between Gowganda and Poi-cupine, witih G map. T. N. O. Railway Commission, Toronto, 1912.
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1913 Cobalt=INickel Arsenides and Silver 75 Inclusion of Lorrain Arkose and Quartzite with Cobalt Series The arkose and quartzite, to which the name Lorrain is applied in preceding edi-tions of the report and on the colored maps, occurs in certain localities somewhaldistinct from the conglomerate and other fragmental rocks of the productive part ofthe Cobalt area. For this reason and owing to the discovery of an unconformitybetween the arkose and the greywacke, such as that in which the veins arc found atCobalt, the Lorrain arkose and quartzite were named, provisionally, in former editionsof the report, Middle Huronian. The unconformity referred to, as shown in followingparagraphs, is not always present between the greywacke, or the rocks which areassociated with it at Cobalt, and the arkose in the surrounding areas. In fact, thereappears, judging from the observations of several workers in the region, to be in manycases a conformable sequence from the Cobalt conglomerate and greywack

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