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| Keywords: The Quarterly journal of the Geological Society of London (13071044613).jpg 88 <br> PEOCEEDTNGS OF THE GEOLOGICAL SOCIETY <br> Dec 19 <br> stiff whitish clay wholly unstratified containing much chalk debris <br> and occasional quartzose erratics Its appearance is so like that <br> of the Bonlder-clay No 7 of figs 2 3 which caps the high land <br> on each side of the valley that but for its position it could not be <br> distinguished from it It occurs at a slight elevation from the bot- <br> tom of the valley resting on the chalk and is from 9 to 15 feet in <br> thickness In one part of the pit it is capped by laminated sands <br> and clays which since their deposition have been subjected to dis- <br> turbance and denudation as represented in the accompanying section <br> Pig 1 ” Section exJiibitecl hy the pit at Trowse Junction being that <br> shown below the Railivay EmbanTcment in Jig 2 <br> 1 Chalk c Laminated blue clay passing up <br> a The clay into <br> b Yellow sand passing up into d Yellow sand <br> e Warp <br> In May 1866 Mr Searles Y Wood Jun while examining the <br> country for the purpose of tracing the extension of the ChiUesford <br> beds in this district discovered a still more extensive development <br> of what I believe to be the same deposit about three miles further <br> down the valley near the Lunatic Asylum and within a few hun- <br> dred yards of the well-known Thorpe crag-pit In this case there <br> are no laminated beds overlying it and the clay is of a somewhat <br> darker colour ; but in other respects it corresponds with that of the <br> last section resting as in that case on the chalk and but slightly <br> elevated above the level of the Eiver Yare Not only is there here <br> a large pit where the clay is exposed but the turnpike road is cut <br> through it for some distance <br> Pigs 2 and 3 will show the position of the deposit relatively to <br> the other beds of the district <br> It will be observed that in fig 3 the Boulder-clay No 7 is not <br> represented as occurring on the north side of the valley its place <br> being supplied by the coarse plateau gravel No 8 This gravel ex- <br> tends for some miles over what is known as Mousehold Heath a pla- <br> teau to the north-east of Norwich forming a sheet in places from <br> 15 to 20 feet in thickness It has apparently been formed by the <br> destruction of the Boulder-clay No 7 That the Boulder-clay No 7 <br> formerly existed on this side of the valley is shown by the presence of <br> outliers further to the east One of these outliers that at Strump- <br> shaw is overlain by the gravel No 8 <br> If these sections be correct it will appear that the deposit treated 36344815 112028 51125 Page 88 Text v 23 http //www biodiversitylibrary org/page/36344815 1867 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 23 1867 Geology Periodicals Smithsonian Libraries bhl page 36344815 dc identifier http //biodiversitylibrary org/page/36344815 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-10 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13071044613 2015-08-26 14 52 21 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1867 The Quarterly journal of the Geological Society of London 1867 Photos uploaded from Flickr by Fæ using a script | ||||
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