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| Keywords: The Quarterly journal of the Geological Society of London (13369063194).jpg 1872 <br> NICHOLSON NORTH SHORE OF LAKE SUPERIOR <br> 21 <br> Leaving Prince Arthur's Landing by the <br> Dawson Road we pass for the first three or <br> four miles over the black shales and interstra- <br> tified traps of the Lower Copper-bearing <br> series Four or five miles to the north- <br> east of Thunder Bay there comes on a range <br> of syenitic and gneissic rocks of Laurentian <br> age as I should imagine by the interven- <br> tions of an E and W dislocation ; and these <br> continue to be exposed for several miles <br> These in turn are succeeded to the N W by <br> a vast series of rocks referable to the Huro- <br> nian Group see Map fig 1 and section fig 2 <br> The first members of this series consist of <br> greenish or grey slates with bands of gneiss <br> and occasional trap-dykes At the Govern <br> ment post known as the Fifteen-mile <br> Shanty and from here up to the foot of Lake <br> Shabendowan a distance of 32 miles we cross <br> a succession of bedded traps mostly green in <br> colour interstratified with great masses of <br> greenish grey or drab-coloured slate The <br> road runs a little to the north of west and <br> the general strike of the beds is W by IS <br> and E by S ; so that the actual thickness <br> of beds crossed over though very consider- <br> able is not so great as might at first sight <br> appear to be the case These Huronian <br> slates and traps present a most singular <br> resemblance to the green slates and por- <br> phyries of the Lake -district of the north <br> of England This likeness is shown in their <br> mode of weathering in the kind of scenery <br> produced and especially in the lithological <br> character of the slates The slates in ques- <br> tion have a prevailing green colour are <br> usually fine-grained but are not unfre- <br> quently brecciated and are divided by a <br> more or less nearly vertical cleavage the <br> direction of which is remarkably persistent <br> over very large areas The surfaces of the <br> slate are not uncommonly glossy ; and in <br> some cases at any rate tbe cleavage ap- <br> pears to coincide with the bedding of the <br> rock These slates have been generally <br> spoken of as talcose or chloritic slates ; <br> but I entertain no doubt that they are truly <br> of the nature of bedded felspathic ashes <br> They do sometimes contain talc and are <br> occasionally serpentinous ; but I am satisfied <br> q <br> oq <br> <br> K <br> SQ <br> OQ <br> W <br> w <br> K <br> hJ <br> Q <br> MtfAY 39050895 120601 51125 Page 21 Text v 29 http //www biodiversitylibrary org/page/39050895 1873 Geological Society of London NameFound Huro NameConfirmed Huro EOLID 4602022 NameBankID 177214 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 29 1873 Geology Periodicals Smithsonian Libraries bhl page 39050895 dc identifier http //biodiversitylibrary org/page/39050895 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13369063194 2015-08-26 10 51 06 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1873 Photos uploaded from Flickr by Fæ using a script | ||||
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