Keywords: The Quarterly journal of the Geological Society of London (12895008833).jpg 212 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Mar 9 <br> M Hebert also points out in a striking manner the variable <br> nature of the Jurassic rocks of France from the frequent oscillations <br> then affecting the north of that empire In the Grindelwaldt <br> Switzerland and in large areas around M Escher von der Linth <br> found Jurassic beds superposed directly on granite and subcrystal- <br> line rocks In the Valley of St Ortee Mannee and at Perdas de <br> Fogue Isle of Sardinia a magnesian limestone Jurassic covers <br> horizontally carbonaceous shales which in their turn rest on <br> Lower Silurian and thus indicate two separate and large blanks <br> We miss Lias Trias Permian Devonian c J ; and I infer among <br> other things that a Carboniferous basin laid long bare to the sky ; <br> but not without effect as we shall see <br> In the South of France M Fournet§ met with Oxford Clay <br> resting on Trias near Valence and likewise near St Ambroux <br> In Poland Oolite is incumbent on Muschelkalk and the sand- <br> stone of its third stage on both porphyry and melaphyr ; Ox- <br> fordian also rests on Muschelkalk in the Himalayas 4 The Ju- <br> rassic series is in two places on Carboniferous shales in Sardinia <br> and once in Poland f f In the latter country we find it on Carbo- <br> niferous sandstones as well as in France <br> Fig 7 ” Section at Rochebelle near Alais after Dufrenoy and <br> De Beaumont <br> Metamorphic rocks <br> a Alluvium <br> Coal-measures <br> b Jurassic limestone <br> c Lower Chalk <br> In Russia we have seen that the Oxfordian always rests either <br> on Permian or Carboniferous Murchison assm and in the <br> Mendip Hills Gloucestershire on the latter In the Napoleon <br> Quarry §§ of the Bas Boulonnais this formation is met with on <br> Lower Silurian with of course the omission of many great epochs <br> I have now shown how variable in quantity and constitution is <br> Comptes Rendus vol xliii p 853 <br> t D'Archiac ' Histoire des Progres ' vol vii p 553 <br> t Delia Marmora ' Voyage en Sardaigne ' vol i p 1 11 <br> § D'Archiac ' Histoire des Progres ' vol viii p 193 <br> Ibid vol vii p 553 <br> ¢jf Strachy Quart Journ Geol Soc vol vii p 306 <br> Delia Marmora 'Sardaigne ' vol i p 111 <br> ft D'Archiac ' Histoire des Progres ' vol vii p 553 <br> XX Ramsay Mem Geol Surv Great Britain vol i p 320 <br> §§ Dufrenoy and De Beaumont 'Explication Carte Geol ' vol ii p 155 36089455 111261 51125 Page 212 Text v 20 http //www biodiversitylibrary org/page/36089455 1864 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 20 1864 Geology Periodicals Smithsonian Libraries bhl page 36089455 dc identifier http //biodiversitylibrary org/page/36089455 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-03 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12895008833 2015-08-26 16 53 36 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1864 Photos uploaded from Flickr by Fæ using a script |