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| Keywords: The Quarterly journal of the Geological Society of London (13365630713).jpg 448 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Juiie 5 <br> I <br> § I <br> O <br> § 2 3 <br> 9 ai <br> appears to have been greater towards the <br> N E and less towards the S W ; for whilst <br> it is probable that at Deptford the displace- <br> ment does not exceed 90 feet at Greenwich <br> it is about 120 feet see Section fig 6 and <br> in the Greenwich Marshes 1 60 feet ; the chalk <br> being 1 24 feet from the surface at Greenwich <br> Hospital and 55 feet of London clay having <br> been pierced in the Marshes <br> South of New Cross on the contrary the <br> dislocation which at Deptford produced six <br> faults is reduced to a few undulations and <br> one fault See Section fig 6 <br> About a mile and a half south-east of this <br> line of disturbance and parallel to it there <br> ranges another hue of fault a section of which <br> was formerly to be seen near the lane behind <br> Morden College and near the Tiger's Head <br> at Lee The effect of this dislocation is that <br> the London clay occupies all the low ground <br> drained by the Lee Stream a position not due <br> to it by the dip of the strata which does not <br> exceed 2° There is evidence of the exist- <br> ence of faults near Elthara Chiselhurst and <br> Bromley <br> In the hollow of Tranquilvale is a recon- <br> struction of the strata which crop out in the <br> sides of the valley This was well exposed <br> in the cutting east of the Blackheath Station <br> The section fig 7 exhibits the contor- <br> tions of part of this reconstruction the un- <br> disturbed bed at the base being the ash- <br> coloured sand No 2 with ferruginous strings <br> and concretions The fragments of shell are <br> derived from No 4 ; the coloured clay and <br> greensand from No 3 <br> These contortions may be owing to glacial <br> action ; and there is evidence of action of the <br> same kind in the centre of Blackheath It <br> is not impossible that the few feet of loam <br> c which there lie on the pebble-bed may be <br> a reconstruction if not the commencement <br> of the London clay <br> All the low ground about the Lee Stream <br> The following series of beds were penetrated by <br> the well at Greenwich Hospital alluvium 10 feet ; <br> gravel drift or pebble-bed 35 feet ; black sand <br> blue clay and shelly rock equivalent to No 4 9 feet ; <br> red clay white sand and green sand and pebbles <br> No 3 12 feet ; sand No 2 57 feet resting on chalk 36934319 113689 51125 Page 448 Text v 6 http //www biodiversitylibrary org/page/36934319 1850 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 6 1850 Geology Periodicals Smithsonian Libraries bhl page 36934319 dc identifier http //biodiversitylibrary org/page/36934319 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13365630713 2015-08-26 10 57 13 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1850 Photos uploaded from Flickr by Fæ using a script | ||||
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