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| Keywords: The Quarterly journal of the Geological Society of London (12646145324).jpg 1862 <br> DARWIN BUENOS AYRES <br> 69 <br> downwards from the level of the Rio Plata to a depth of 61 feet <br> and to this must be added 55 feet above the level of the river <br> These argillaceous beds overlie coarse sand containing the Azara <br> labiata a shell characteristic of the Pampean formation and at- <br> taining a thickness of about 93 feet So that the entire thickness <br> Fig 1- <br> – Comparative Sections of the Artesian Wells of Bar rams <br> and Buenos Ay res Distance 3f miles <br> Buenos Ayres <br> Barraeas Riachuelo <br> Level of equi- <br> librium of <br> the princi- <br> pal spring <br> 1st spring <br> 2nd spring <br> 3rd spring <br> ˘4th spring <br> M <br> – J <br> <br> -S <br> h <br> High-water level <br> <br> 1 <br> n <br> H 2nd spring <br> jj 3rd spring <br> 1 4th spring 245 feet <br> 1 2 <br> 470 feet <br> 13 <br> 47 <br> Thickness at <br> Barraeas <br> Feet <br> a Clays and Tosca <br> b Sand <br> c Very sandy clay ~ <br> d Dark -blue plastic clay <br> e Tosca with calcareous nodules I <br> / Yellow sands very fine and fluid 94 <br> g Green sands 66 <br> h Tertiary clay and sandstone for details see fig 2 34 <br> Tc v Hard sandstone at the bottom of the Barraeas <br> Well <br> ÂŁ 2 Very calcareous red clay becoming more marly <br> beneath ; bored through to a depth of <br> Thickness at <br> Buenos Ayres <br> Feet <br> 57 <br> 51 <br> <br> 52 <br> 45 <br> 62 <br> 33 <br> 225 <br> The following extract from the Report of the borers relates to this bed ” <br> The bed of yellow fluid sands between 18 m 60 and 47 m '20 below the ground 35328028 109632 51125 Page 69 Text v 19 http //www biodiversitylibrary org/page/35328028 1863 Geological Society of London NameFound Azara labiata Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 19 1863 Geology Periodicals Smithsonian Libraries bhl page 35328028 dc identifier http //biodiversitylibrary org/page/35328028 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 N02/12646145324 2015-08-27 11 59 44 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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