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| Keywords: The Quarterly journal of the Geological Society of London (12826763354).jpg PRESTWICH FOSSILIFEROUS IRONSANDS N DOWNS 327 <br> Fig 4 Diagram-section of the Ironsands in their original hori- <br> zontal position <br> t ffS iMWWr M f Yellow sands passing down into <br> pjjjjil 2 ' EJ e Light-red sand and clay <br> l~ ~ y i\ d ' I Greenish and yellow sands with a subordinate seam <br> i l ' jr of ironstone c and some flint-pebbles <br> V _ r -- <br> Wm SB a Chalk-flints m Clay <br> Apart from the great scarcity of shell-impressions the ironstones <br> in this pit are precisely similar to those in the Lenham pit ; and it is <br> to be observed that there also only portions of the ironstone contain <br> fossils Amongst the fossils sent me by Mr Jones was a specimen <br> of a large Terebratula ; and when afterwards at Lenham I was for- <br> tunate enough to discover another tolerably perfect cast and it sud- <br> denly struck me from this and other fossils that it might be the large <br> Crag species both from its size and general appearance and from the <br> absence of any species of that magnitude in our Eocene series On <br> hastening to compare it with the figures in Mr Davidson' s Monograph <br> I found that it bore the closest resemblance in figure and size to the T <br> grandis I again examined the other fossils but with the exception of <br> the impression of a Scalaria which resembled the S subulata I could <br> obtain no satisfactory result In the summer of 1856 I made another <br> visit to Lenham and found in addition to former species a large <br> Mya-shaped shell f also different to any of the Lower Tertiary fossils <br> with which I was acquainted and reminding me of a Crag species <br> On mentioning these facts to Mr Searles Wood he kindly undertook <br> to examine the specimens and has favoured me with the appended <br> report see p 333 <br> I must confess to hold a stronger opinion on the subject than Mr <br> Wood for there are collateral circumstances which greatly strengthen <br> my belief of these beds belonging to the Crag little as I was pre- <br> pared to meet with the Crag at such an elevation and such a di- <br> stance from the main mass In the first place I know of no Eocene <br> strata in the London Tertiary area quite like this deposit in its litho- <br> logical structure Secondly no London Clay or Lower Tertiary strata <br> contain any Terebratula that can be compared to the T grandis or <br> a Lutraria like the specimen from Lenham ; whilst no Echini with <br> club-shaped spines nor Emarginuloe Mactrce nor Nassce have <br> hitherto been met with in the London Clay or in the beds of <br> sand beneath it ; again Bryozoa which are common at Lenham are <br> These appear in other places to pass upwards into loamy yellow sands with <br> subordinate seams of ironstone and some irregular beds of clay Some slightly <br> mottled clays above Otford appear to me to belong to this group although much <br> resembling the mottled clay of the Reading series It is a question also whether <br> a few sandstone-blocks are not occasionally concreted in these sands <br> f Probably the Lutraria elliptica 36214301 111684 51125 Page 327 Text v 14 http //www biodiversitylibrary org/page/36214301 1858 Geological Society of London NameFound Bryozoa NameConfirmed Bryozoa EOLID 2060 NameBankID 230461 NameFound Echini NameConfirmed Echini NameFound Lutraria NameConfirmed Lutraria EOLID 57862 NameBankID 2693297 NameFound Lutraria elliptica NameConfirmed Lutraria elliptica NameFound Scalaria NameConfirmed Scalaria EOLID 4856646 NameBankID 245500 NameFound Scalaria subulata NameConfirmed Scalaria subulata NameFound Terebratula NameConfirmed Terebratula EOLID 13755808 NameBankID 4365172 NameFound Terebratula grandis NameConfirmed Terebratula grandis NameBankID 5549820 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 14 1858 Geology Periodicals Smithsonian Libraries bhl page 36214301 dc identifier http //biodiversitylibrary org/page/36214301 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-28 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12826763354 2015-08-26 17 56 34 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1858 Photos uploaded from Flickr by FĂŚ using a script | ||||
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