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| Keywords: The Quarterly journal of the Geological Society of London (12893443683).jpg 18 <br> PEOE T G BONNET ON THE SECTIONS NEAE Feb 1 897 <br> At the time of my last visit the junction of the main mass of <br> marble with the overlying Jurassic rock could be seen at three <br> places One is in a very small opening on the western side of the <br> pass just beyond the end of the crag of marble overhanging the road <br> Here we found in descending order fig 2 a subcrystalline lime- <br> stone weathering bluish - <br> grey banded with a blackish Fjo 2 <br> slaty rock about 18 inches ; <br> 4 black messy stuff ' the <br> above slaty rock crushed <br> about 6 inches ; the slabby <br> marble crushed The two <br> other sections are on the <br> eastern side of the pass and <br> were exposed in small quar- <br> ries which had been opened <br> by the roadside since my <br> visit in 1894 The first was <br> about 120 yards from the <br> ˘ dependance ' Here we see <br> 1 a slabby dull-coloured <br> subcrystalline limestone <br> parted by darker and more <br> argillaceous bands ; 2 a <br> foot or so of 'dark messy <br> stuff ' corresponding with <br> that in the last section ; <br> 3 the marble 1 which rose <br> to a height of about 15 feet <br> above the road Its surface has a somewhat wavy outline and its <br> upper part is evidently in a rather crushed condition This is the <br> top of the mass of marble which in 1891 we traced up the slope of <br> the valley below and which passes behind the ' dependance ' forming <br> the crag by the roadside farther west Two other small pits near <br> together are found about 40 yards east of that just described each <br> showing a similar section In all these exposures two rocks of very <br> different mineral character appear in close sequence and suggest <br> by their aspect some amount of faulting <br> 1 Marble rather crushed <br> X Top slab specimen taken <br> 2 Subcrystalline limestone with argil- <br> laceous slaty partings <br> 2' Crushed slaty or shaly rock 'black <br> messy stuff' about 6 inches thick at <br> most <br> 3 Debris <br> On previous visits I had observed certain macroscopic differences <br> between the marble and the admittedly Jurassic limestone but on <br> this occasion became more than ever convinced of their existence <br> The most important may be stated as follows ” The marble if <br> unstained is lighter in colour on a freshly -broken surface; on <br> weathered surfaces it turns to a pale fawn colour with occasional <br> browner bands These are more micaceous and project a little <br> from the rest of the rock The Jurassic limestone is darker <br> in colour becomes greyish-blue or bluish-grey in weathering and <br> No 2 of the section described on p 294 op cit 36028723 111130 51125 Page 18 Text 53 http //www biodiversitylibrary org/page/36028723 1897 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 53 1897 Geology Periodicals Smithsonian Libraries bhl page 36028723 dc identifier http //biodiversitylibrary org/page/36028723 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-03 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12893443683 2015-08-26 17 57 07 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1897 Photos uploaded from Flickr by Fæ using a script | ||||
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