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| Keywords: The Quarterly journal of the Geological Society of London (13204784753).jpg 206 <br> J S GARDNER ON THE LOWER LONDON TERTIARIES <br> feet of deep yellow slightly loamy sand and then by quartzose sand <br> without green grains At Oldhaven Gap the full thickness of the beds <br> 26 feet is seen the upper surface being very uneven and the fossils <br> casts only The sands vary considerably in hardness but at no par- <br> ticular levels 250 yards west there are several small clay patches <br> the thickest a foot deep These are sharply denned above but <br> below mix gradually with the sand contain much selenite and are <br> cemented into sandy concretions which display beautiful ripple- <br> marks and false-bedding They are marked with horizontal borings <br> from one to one and a half inch wide The clay patches frequently <br> rest on the pebbles but are sometimes separated by drifts of broken <br> shells ; angular pieces of clay are occasionally included and some- <br> times an indurated patch of lemon-coloured sand with iron-stains <br> 140 yards west the beds are 21 feet thick and very fossiliferous with <br> green grains towards the base A lenticular patch of clay with sandy <br> laminae larger than usual here encloses a Sarsen stone ; and on the <br> same horizon a few yards east are irony concretions crowded with <br> shells 160 yards west the shells approach within 2 feet of the Lon- <br> don Clay and there is much false-bedding ; and 90 yards further west <br> again a few concretionary blocks ore seen just above high water-mark <br> The bedding of the sand is lenticular ; and the shells are almost com- <br> minuted and also drifted into lenticular form both the sand and <br> the shell-drifts being cut through again and again A good section <br> is seen 500 feet before the beds dip under the London Clay fig 7 <br> Fig 7 ” Section showing Junction of London Clay and Oldhaven <br> Series <br> a London Clay b Basement-bed <br> c Sections across the ancient furrows of the shore <br> d Broken shells deposited in furrows <br> The Oldhaven Beds sink under the London Clay at about a mile <br> east of Heme Bay Their upper surface is eroded and filled in by <br> the basement-bed of the London Clay here only from 12 to 18 inches <br> thick The basement-bed is of a warm drab colour mottled with 36928803 113681 51125 Page 206 Text 39 http //www biodiversitylibrary org/page/36928803 1883 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36928803 dc identifier http //biodiversitylibrary org/page/36928803 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13204784753 2015-08-26 13 53 46 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by Fæ using a script | ||||
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