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| Keywords: The Quarterly journal of the Geological Society of London (12511918805).jpg of these well- <br> known sections ; and the accompanying sketch is simply used to help <br> the memory and to give coherence to the subjoined remarks <br> Fig 3 � Diagram showing the succession of rocks from the May Hill <br> Sandstone upwards <br> S W May Hill N E <br> 1 Coal-iield of the Forest of Dean <br> 2 Mountain limestone <br> 3 Old Red Sandstone <br> 4 Upper Ludlow <br> 5 Aymestry limestone <br> 6 Lower Ludlow <br> 7 Wenlock limestone <br> 8 Wenlock shale <br> g Woolhope limestone <br> 10 May Hill sandstone <br> The Woolhope sections are the most perfect and symmetrical ; <br> but the May Hill section was best for our purpose ; viz to examine <br> and connect together the two groups which are at the base of the <br> section In the May Hill section we have the following groups in <br> true descending order � 1 The Carboniferous series ; 2 The Old- <br> red-sandstone ; 3 The Ludlow series Nos 4 5 6 of the sketch ; <br> 4 The Wenlock series Nos 7 8 of the sketch Respecting these <br> four groups there has been no doubt since the Silurian Sections were <br> first published by Sir R I Murchison 5 These groups are fol- <br> lowed by thin bands of concretionary limestone No 9 of the sketch <br> separating the base of the Wenlock shales from the underlying grits <br> of May Hill 6 The shelly sandstones and grits which form the <br> dome-like elevation of May Hill No 10 <br> The last two groups of this section were considered in the Silu- <br> rian System as Caradoc sandstone Subsequent labourers espe- <br> cially Professor Phillips have pointed out good reasons for regarding <br> the bands of concretionary limestone as an integral part of the Wenlock <br> series ; but he and the other Government Surveyors have coloured and <br> described the May Hill grits c as Caradoc sandstone <br> The bands of limestone last mentioned might I think be most <br> conveniently called Lower Wenlock limestone ; but the name Wool- <br> hope limestone having for some time passed current I will here <br> adopt it All the Silurian limestones are local phsenomena ; none <br> of them are so persistent as to offer good terms of comparison be- <br> tween countries of the same age which are widely separated This <br> remark applies with all its force to the Woolhope limestone Round <br> May Hill it is in many places so degenerate as to have been over- <br> looked in the sections At Littlehope and in other places within <br> the Woolhope elevation it is more clearly developed and cannot <br> escape notice as it is extensively burnt for lime At Presteign it <br> reaches its maximum of development ; and it there so entirely re- <br> sembles the most complete form of Wenlock limestone that for many <br> years it was confounded with that rock <br> See Quart Journ Geol Soc vol vi p 435 <br> VOL IX � PART I Q 34983332 108767 51125 Page 219 Text v 9 http //www biodiversitylibrary org/page/34983332 1853 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 9 1853 Geology Periodicals Smithsonian Libraries bhl page 34983332 dc identifier http //biodiversitylibrary org/page/34983332 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-14 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12511918805 2015-08-27 09 56 52 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1853 Photos uploaded from Flickr by Fæ using a script | ||||
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