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| Keywords: The Quarterly journal of the Geological Society of London (12645128603).jpg 176 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY DeC 13 <br> conglomerate is here intercalated in the talc schists and dips with <br> them A little above or N of Petit Coeur a momitain rill descending <br> from N E to S W waters the highly inclined faces of these talc <br> schists or rather occupies a deep gorge in them to the east of which <br> these same beds are seen to graduate up into and to be surmounted <br> by others which contain belemnites and plants the whole in perfectly <br> conformable apposition and at angles from 70° to 75° as expressed <br> N W <br> Fig 2 <br> Petit-coeur <br> S E <br> Talc schist <br> 1 Talc schist with sandstone <br> 2 Black slates Belemnites <br> 3 Talc schists with anthracite <br> 12 3 4 5 Jurassic rocks <br> 4 Grits sandstone c <br> 5 Jurassic schists c <br> tt Coarse detritus and blocks <br> in the woodcut fig 2 The upper portion of the inferior or cry- <br> stalline strata is a light-coloured talc schist used in the mountains <br> for the covering of cottages It is called ' ardoise blanche by the <br> quarrymen and forms the floor of the quarry 1 Immediately <br> upon this and perfectly parallel to it lies another stratum 2 of fissile <br> calcareous flagstone of dark indigo colour called ardoise noire in <br> which the belemnites occur I could detect no slaty cleavage in these <br> beds whilst both the shining or talcose and the dull black or calca- <br> reous flagstones strike N N E and dip together 70° to 75° E S E <br> They are further connected by certain bands of hard sandstone oc- <br> casionally coarse and gritty with which the dark flags alternate to- <br> wards their base In the lower quarry there being several openings <br> in the line of strike in order to procure the black calcareous flagstone <br> these belemnitic beds are seen to be surmounted by another band of <br> talc schist 3 as conformable to the belemnite flags or slates 2 as <br> the latter are to the inferior talc schist I The uppermost of the <br> three beds is that in which a certain portion of anthracite has been <br> detected the exploration of which has led to the discovery of numerous <br> plants These plants chiefly lie in the floor of the anthracitic schist <br> and therefore within a few feet of the belemnite flags 2 and they <br> are strikingly distinguished by the brilliant white relief of the frame- <br> work of the vegetables due to the dissemination of the talc upon the <br> dark ground of the schist or flagstone Much pyrites in single cry- <br> stals and bunches occurs throughout the rock <br> This carbonaceous schist with plants several yards thick is sur- <br> mounted by strong beds of dark grey hard grit that weathers to a <br> rusty colour and which alternates several times with dark-coloured <br> schists And here it is to be observed that the sandstone 4 above <br> the coal plants is not to be distinguished from the band beneath the <br> belemnite flagstone; or in other words hoth the belemnite and the <br> plant beds form parts of the same geological mass the upper and <br> lower parts of which are of similar composition the talc schist and 35268820 109512 51125 Page 176 Text v 5 http //www biodiversitylibrary org/page/35268820 1849 Geological Society of London NameFound Belemnites NameConfirmed Belemnites EOLID 4780330 NameBankID 4089090 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 5 1849 Geology Periodicals Smithsonian Libraries bhl page 35268820 dc identifier http //biodiversitylibrary org/page/35268820 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645128603 2015-08-27 10 57 02 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1849 Photos uploaded from Flickr by Fæ using a script | ||||
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