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| Keywords: The Quarterly journal of the Geological Society of London (13889237138).jpg ASSOCIATED ROCKS OF PORTHALLA COVE <br> 461 <br> becoming more siliceous All <br> these beds I regard as newer <br> than the rocks of Nelly's Cove <br> and those immediately to be <br> described both the latter hav- <br> ing a more considerable dip to <br> the S E or E S E They have <br> probably been let down by a <br> pair of faults <br> We now come to the tract <br> which forms the main subject <br> of this paper extending east- <br> ward from the fault to Mr <br> Hickes's quarry about 5 of a <br> mile in all This is illustrated <br> in sections figs 2 and 3 These <br> rocks are considered by Prof <br> Bonney to represent the Ar- <br> chaean metam Orphic series of <br> the Lizard Head which he di- <br> vides into three groups as <br> under ” <br> The micaceous or lower <br> group <br> The hornblendic or mid- <br> dle group <br> The granulitic or upper <br> group <br> He thinks he can identify <br> here the micaceous group <br> containing in its upper part a <br> stratum of granulite similar in <br> character to the upper group <br> and also the middle or horn- <br> blende series in which occurs <br> the serpentine This latter <br> he maintains is decidedly in- <br> trusive <br> Thus Prof Bonney considers <br> that two out of the three sub- <br> divisions of his Lizard Archaean <br> series are represented here To <br> me the evidence seems all the <br> other way In the first place <br> the rocks are very distinct both <br> chemically and mineralogically <br> as I shall show hereafter ; of <br> much greater importance how- <br> ever is the difi erence of strike <br> Q J G S Sro 59 <br> ° o <br> Hickes s Quarry <br> Hornblende schist <br> ”Serpentine <br> -Hornblende schist <br> – Serpentine <br> ”Hornblende schist <br> – ˘ Serpentine <br> --Hornblende schist <br> -Serpentine <br> -Serpentine <br> Eed shale <br> M ± <br> _ Micaceous Group ofj <br> Prof Bonney <br> -Fault No 2 <br> i Non-micaceous base <br> \ of Prof Bonney's <br> Micaceous Group <br> - Granulitic group <br> Fault No 1 <br> Porthalla slates <br> I ” ” ” ” -Porthalla <br> to <br> I <br> 5s <br> o <br> 2i 36941280 113697 51125 Page 461 Text 40 http //www biodiversitylibrary org/page/36941280 1884 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 40 1884 Geology Periodicals Smithsonian Libraries bhl page 36941280 dc identifier http //biodiversitylibrary org/page/36941280 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889237138 2015-08-26 05 57 19 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by Fæ using a script | ||||
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