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| Keywords: The Quarterly journal of the Geological Society of London (13365240155).jpg 1850 <br> PRESTWICH ON THE LOWER TERTIARY STRATA <br> 259 <br> tiaries They enable us to trace the sands and mottled clays with- <br> out much difficulty over a large district ; but although these lower <br> tertiary beds are so frequently worked and their relation to the <br> chalk underlying them is often shown the sections nevertheless <br> rarely exhibit the overlying lower beds of the London clay <br> At the base of the chalk hills between Inkpen and Basingstoke <br> there are a considerable number of sections more or less perfect <br> of these lower tertiary beds One of the best and most illustrative <br> is in a brick-field at Itchingswell two miles westward of Kingsclere <br> See fig 4 <br> Fig 4 � Section at Iti/ / // <br> d ~~t b <br> b London clay ; upper part bluish grey passing down into brown ; sandy at base ; a few calca- <br> reous concretions and a few fossils The lower part of this bed should perhaps be in- <br> cluded in c <br> c Ferruginous sand and iron sandstone mixed with green sand and full of round flint pebbles <br> varying in size from 1 to 14 inches in diameter ; no fossils except a few teeth of Lamnce <br> d Mottled clay and sands <br> The chalk outcrops at a distance of about 50 feet from e <br> Organic remains of stratum c at Itchingswell <br> Cancellaria laeviuscula Desh Nucula <br> Cytherea obliqua Desh Panopsea intermedia Sow <br> Ditrupa plana Sow sp Pectunculus Plumsteadiensis Sow <br> Ostrea large species <br> These fossils occur at the base of 6 just above c <br> A section at Chinham one mile and a half north-east of Basing- <br> stoke on the line of railway from that town to Reading showed the <br> basement conglomerate bed passing gradually upwards into the mass <br> of the London clay The organic remains were numerous but in a <br> very friable state See fig 5 <br> Fig 5 � Section at Chinham <br> �London clay ; thin-bedded brown clay with- <br> out fossils passing downwards into dirty <br> yellow sands with seams of brown clay <br> and then into a sandy light-coloured clay <br> c with seams of green sand and a few <br> round flint pebbles occasionally concreted <br> into small flat masses by carbonate of <br> lime ; traces of vegetable matter ; shells <br> abundant in the seams and patches of <br> green sand but very friable and generally <br> in the state of casts Average thickness <br> of c 5 feet <br> Mottled red and brown clays ; upper surface slightly uneven and worn <br> The junction with the chalk which crops out immediately on the <br> opposite side of the small valley formed in these lower sands is not <br> exposed <br> Organic remains of stratum ' c ' at Chinham <br> Cassidaria striata Sow Fusus small species <br> Cardium Plumsteadiense Sow Modiola elegans Sow <br> Cytherea ovalis var Sow Natica glaucinoides Sow <br> Ditrupa plana Sow sp Hantoniensis Pilk 36934114 113689 51125 Page 259 Text v 6 http //www biodiversitylibrary org/page/36934114 1850 Geological Society of London NameFound Cancellaria laeviuscula NameFound Cardium NameConfirmed Cardium EOLID 50301 NameBankID 2693257 NameFound Cassidaria striata NameConfirmed Cassidaria striata Lamarck 1816 NameFound Cytherea obliqua NameFound Cytherea ovalis NameFound Ditrupa plana NameConfirmed Ditrupa plana NameFound Fusus NameConfirmed Fusus EOLID 2988518 NameBankID 4173880 NameFound Modiola elegans NameConfirmed Modiola elegans NameBankID 6464534 NameFound Natica glaucinoides NameFound Nucula NameConfirmed Nucula EOLID 10719654 NameBankID 2691879 NameFound Ostrea NameConfirmed Ostrea EOLID 10719983 NameBankID 2692450 NameFound Panopsea intermedia NameConfirmed Panopaea intermedia NameFound Pectunculus NameConfirmed Pectunculus EOLID 4728114 NameBankID 4286045 NameFound Plumsteadiensis Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 6 1850 Geology Periodicals Smithsonian Libraries bhl page 36934114 dc identifier http //biodiversitylibrary org/page/36934114 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 N02/13365240155 2015-08-26 11 59 34 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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