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| Keywords: The Quarterly journal of the Geological Society of London (12646147944).jpg 70 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY <br> Dec 3 <br> of the great estuarine or Pampean formation near Buenos Ayres is <br> nearly 210 feet <br> Fig 2 ” Detailed Section of the Artesian Well at Barracas <br> Thickness <br> in metres <br> a Sand 4'33 <br> b Very arenaceous clay 8 - 02 <br> fFineclay 1-05 <br> °' \ Blue plastic clay 2-90 <br> d Tosca with calcareous nodules 230 <br> e Yellow sand very fine and fluid with quartz- <br> pebbles and fluviatile shells 28'60 <br> / Green clay more or less plastic and calcareous <br> with iron-pyrites marine shells and nodules <br> of lithographic stone 20 30 <br> g Green sand with shells and quartz -pebbles '80 <br> k Shelly limestone 45 <br> i Calcareous clay 2 00 <br> Jc Shelly sandstone -25 <br> / Green arenaceous clay 2 00 <br> m Shelly sandstone -30 <br> n Speckled sand -70 <br> o Very compact arenaceous clay 2 25 <br> p Coarse sandstone 140 <br> q Green sand very fine and fluid with quartz- <br> pebbles and shells 2 35 <br> This formation rests on various marine beds of indurated green <br> clay sand with corals sandstone and limestone altogether 107 feet <br> in thickness These beds contain fragments of the great Ostrea <br> Patagonica 0 Alvarezii Pecten Paranensis and other shells <br> apparently the same but they have not been rigorously compared <br> with those enumerated by M A d'Orbigny and by myself as found <br> at Sta Pe Bajada as well as at various points on the coast of Pata- <br> gonia The already enormous continuous extension of the Pata- <br> gonian Tertiary formation is thus largely increased Beneath these <br> beds a mass of red calcareous clay becoming in the lower part more <br> and more marly containing layers of sand and of the thickness of <br> 213 feet was bored through to a depth of 470 feet from the level of <br> contains a subterranean ascending current the level of which has not varied by <br> a centimetre for three years The level is m 60 2 feet over the level of the <br> wells at Barracas This bed 'napa' is powerfully absorbent At 68 m 30 a <br> second subterranean current 'overflowing' w r as met which rose one foot <br> over the surface of the ground at Barracas The discharge was about 50 pipes <br> daily but the water was salt and undrinkable At 73 m 30 was found a third <br> subterranean current 'overflowing' which reached with difficulty the level <br> of the ground The discharge might be calculated at 100 pipes daily The <br> water was very salt and absorbed that of the first overflowing current The <br> great spring was met with at 77 m 65 <br> As regards the quality and abundance of the water Mr Coghlan remarks that <br> The quantity of water discharged per hour through a tube of about 4-i- inches in <br> diameter at a level of 6 feet above high-water mark was 2658 gallons Its tem- <br> perature was 21° Cent and it had a slightly disagreeable taste from its being <br> impregnated with salts of lime and magnesia and a small quantity of sulphu- <br> ret ted hy drogen ' ' 35328029 109632 51125 Page 70 Text v 19 http //www biodiversitylibrary org/page/35328029 1863 Geological Society of London NameFound Ostrea NameConfirmed Ostrea EOLID 10719983 NameBankID 2692450 NameFound Paranensis NameFound Patagonica NameConfirmed Patagonica NameBankID 4858885 NameFound Pecten NameConfirmed Pecten EOLID 10719936 NameBankID 2692292 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 19 1863 Geology Periodicals Smithsonian Libraries bhl page 35328029 dc identifier http //biodiversitylibrary org/page/35328029 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12646147944 2015-08-27 11 58 49 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1863 Photos uploaded from Flickr by Fæ using a script | ||||
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