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| Keywords: The Quarterly journal of the Geological Society of London (13889768689).jpg BOTTLDER-CLAYS OF LINCOLNSHIRE <br> 125 <br> entire absence of even ditch-sections prevented my coining to any <br> conclusion on this point <br> The appearances at these three localities being not unfavourable <br> to the supposition that the brown clays passed into chalky clay <br> taken together with the fact of the former clay occurring at so <br> great a height on the Wold as nearly 400 feet inclined me to the <br> belief that there was no great separation in time between the <br> formation of the two series It was not therefore till last year <br> 1883 that I recurred to the opposite opinion in consequence of <br> finding evidence on the west side of the Wolds which forced me to <br> regard the brown clays of that district as belonging to a much more <br> recent period than the blue and chalky clays This evidence may <br> be briefly recapitulated as follows ” <br> 1 The position of the red-brown clays near Brigg resting against <br> ridges of Jurassic clay which are capped by outliers of Chalky <br> Boulder-clay as in fig 3 the two clays being very different in <br> Fig 3 ” Section througJi Low Barf S E of Brigg <br> Horizontal scale 2 inches to a mile <br> d d <br> a Alluvium b E ed Clay c Chalky Clay d Oxford Clay <br> appearance and the former occupying valleys which appear to have <br> been eroded out of a surface composed of Oxford Clay overspread <br> by a sheet of Chalky Boulder-clay <br> 2 The fact that a red-brown clay of similar type actually rests <br> upon a continuation of the older Boulder- clay in the district between <br> Market Basen and Langworth <br> 3 The manner in which the mottled clays separate themselves <br> from the blue Boulder-clay and from a terrace or narrow tract along <br> the western border of the Fenland between it and the highland <br> just as they do between the marshland of East Lincolnshire and the <br> Chalk Wolds <br> To these considerations may be added the following ” <br> 4 The actual superposition of the mottled clay on the blue <br> Boulder -clay at Boston <br> 5 The relative positions of the two clays along the north border <br> of the Pens by East and West Keal where the Brown Clay is <br> banked against the slope of hills capped with Chalky Boulder-clay <br> 6 The fact that while both Boulder-clays are found at the same <br> level south of Bevesby they each retain their distinctive colours <br> and characters and occur in separate areas <br> See Section in Quart Journ Geol Soc vol xxxv p 405 <br> Q J G S No 162 L 37046967 114009 51125 Page 125 Text 41 http //www biodiversitylibrary org/page/37046967 1885 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37046967 dc identifier http //biodiversitylibrary org/page/37046967 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889768689 2015-08-26 04 56 20 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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