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| Keywords: The Quarterly journal of the Geological Society of London (13365168413).jpg 1849 SHARPE ON THE SECONDARY ROCKS OF PORTUGAL 135 <br> transported as ballast but some are lying about and a few remain <br> in situ I have examined all of them and find they are composed <br> of that variety of oohte which has been named Buckingham or Forest <br> Marble Many of them are yellowish externally and bluish within <br> owing probably to a difference in the degree of the oxidation of the iron <br> which has coloured them The largest I have measured was about <br> 3 feet by 4 very angular being but little rounded ; while the smaller <br> ones 30 inches by 20 whose corners had been modified and whose <br> sides had been smoothed were covered with scratches and grooves <br> Section of Railway Cutting at Buckingham <br> 12 3 4 5 <br> 1 Oclireous gravel with boulders of forest 3 Dark claj' with Belemnites and rolled <br> marble and with Grypheese Belemnites fragments of chalk <br> and Ostreee 4 Experimental shaft <br> 2 Grey gravel 5 Grey sand and gravel <br> The cutting see fig is about fifty feet deep and the boulders are <br> sprinkled among gravel sand and clay about ten or twelve feet below <br> the surface ; and are not found lower down among the earlier deposits <br> of smaller pebbles which must have come from all quarters judging <br> from the variety of rocks they contain Out of the latter I picked <br> the fragment of fossil bone I sent you a day or two ago � possibly a <br> portion of my old friend the Cetiosaurian whose tail-bone I sent you <br> some years ago and which you reported to the Society at the time' ' <br> I found one boulder only with perforations ; whether the work of <br> Pholades or the impression of shells or wood you will determine <br> from the specimen I send you taken from one of the largest blocks <br> and lying nearer the surface than any other <br> The country around here is very undulating ; scarcely two fields <br> have a similar aspect or inclination and the hills are capped with <br> gravel which makes it difficult to trace the stratification The con- <br> tortions of the gravel beds are very curious being in some places <br> almost vertical and in others twisted like the letter S according as <br> the bed is cut into obliquely or transversely The gravel has been <br> penetrated to the depth of eighty feet near the pit you saw at Foscot <br> in search of water but without success <br> Looking at the boulders still in situ I tried to make out from the <br> scratches from what direction they had come but could not satisfy <br> myself on that point <br> 2 On the Secondary District 0/ Portugal which lies on the North <br> of the Tagus By Daniel Sharpe Esq F G S <br> General Sketch of Portugal � So little is known of the geology of <br> Portugal that it may be interesting to give a general sketch of that <br> country before proceeding to the details of the district which is to <br> Proceedings of the Geological Society vol ii 1833-38 p 190 <br> L 2 36933960 113689 51125 Page 135 Text v 6 http //www biodiversitylibrary org/page/36933960 1850 Geological Society of London NameFound Belemnites NameConfirmed Belemnites EOLID 4780330 NameBankID 4089090 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 6 1850 Geology Periodicals Smithsonian Libraries bhl page 36933960 dc identifier http //biodiversitylibrary org/page/36933960 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 N02/13365168413 2015-08-26 11 50 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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