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| Keywords: The Quarterly journal of the Geological Society of London (12733664145).jpg ne <br> GEOKGE MAW'S NOTES ON A JOURNEY <br> tions Lower down on either side of the rocky ridge were the Arab <br> flat-roofed habitations built of sun-dried mud bricks embosomed <br> in a dense forest of date-palms many of them from 90 to 100 feet <br> high ; and stretching away from this dark green and brown mass <br> lines and patches of light green vegetation spread out into the desert <br> where its thirsty sand was sucking in the last drainings from the oasis <br> During my stay at L'Aghouat I took sketches and sections of several <br> of the escarpments and rocky outliers represented in Pigs 3 <br> 4 and 5 the most important of which is the Rocher de Chien <br> W S W of the town a jagged hill Fig 5 rising up 300 feet <br> Fig 5 � Rocher de Chien an isolated Roclc Sahara plain west of <br> S E <br> L'Aghouat <br> N W <br> out of the sandy plain and consisting of a hard calcareo-argilla- <br> ceous rock with a N E and S W strike dipping S E under the <br> plain at an angle of 65° At the foot of its N W escarpment <br> occurs a calcareous cream-coloured rock with casts of fossils inclu- <br> ding a Chemnitzia or Turritella underlain by a fine-grained sand- <br> stone with casts of bivalve shells which Mr Etheridge thinks may <br> be of Miocene age The sandstone is succeeded by grey gypseous <br> marls which are lost under the Posttertiary deposit of grey loam <br> filling up as a plain two miles wide the denuded anticlinal between <br> the Rocher de Chien and the boundary escarpment to the north <br> The lower beds of marl and sandstone on the north side of the <br> Rocher de Chien have a less steep inclination than the overlying rock <br> and dip S E at an angle of about 35° The face of the main escarp- <br> ment N E of the town Figs 3 and 4 presents the following succession <br> of beds in ascending order At its base white gypseous marls inter- <br> stratified with bands of fine-grained white stone occur as a low <br> terrace a little in advance of the cliff face and dip 15° N N E with <br> a W S W and E N E strike The main face of the cliff consists of <br> grey marls interstratified with hard bands and gypseous green marls ; <br> and its jagged summit is capped with hard calcareous bands con- <br> taining curious concretionary masses which are very fossiliferous <br> including a spatangoid Urchin which Dr Wright thinks may be a 35765985 110599 51125 Page 115 Text v 30 http //www biodiversitylibrary org/page/35765985 1874 Geological Society of London NameFound Chemnitzia NameConfirmed Chemnitzia EOLID 4813168 NameBankID 2799449 NameFound Turritella NameConfirmed Turritella EOLID 52187 NameBankID 2683895 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 30 1874 Geology Periodicals Smithsonian Libraries bhl page 35765985 dc identifier http //biodiversitylibrary org/page/35765985 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12733664145 2015-08-26 20 04 31 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1874 Photos uploaded from Flickr by Fæ using a script | ||||
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