File:Annual report (1910) (14773322795).jpg

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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beenobserved, as is shown in the following table, still, while the thickness of the membersdiffers from place to place, there is a pronounced definite order of deposition in theareas which have been studied by various workers throughout a wide region. Thefollowing quotations show that the order of succession of the members of the seriesin the surrounding areas is similar to that at Cobalt itself (Fig. 22, map). Speaking of the Cobalt series at Larder lake, which lies about fifty miles north ofCobalt. Mr. Morley E. Wilson says: An approximately regular succession can berecognized in the Huronian of this district. At the base is a conglomerate, whichpasses gradually upward through greywacke into arkose, which in its turn grades intoan upper conglomerate.* Of the series in the Montreal River area, forty miles northwest of Cobalt, Mr. W.H. Collins says: The basal member is a conglomerate sometimes possessing a brecciaGeo. Sur. Can. 1909, p. 176. 1913 Cobalt=Nickel Arsenides and Silver 77
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78 Bureau of Mines No. 4 structure and remarkable for the irregular distribution and frequently enormous sizeof its included boulders. This grades upward through greywacke into finely laminatedslate and quartzite, followed in turn by an upper conglomerate.* In Gowganda, fifty miles or more west of Cobalt, according to Mr. Collins, thesame succession is observed: ... rocks are of clastic nature, consisting inascending order of conglomerate, greywacke, slate and quartzite, which pass conform-ably into an upper conglomerate, while a granite-like, arkose member is believed, fromits similarity to rocks of the same character in the Cobalt area, to be possibly oflater age.** Thickness Having been subjected to erosion during most of the vast period that has elapsedsince pre-Cambrian time, the uppermost members of the series have been removed, thusmaking an exact determination of the original thickness of the series impossible. Moreover, complete sections of the thicker exposures of these rock

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