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| Keywords: The Quarterly journal of the Geological Society of London (12894969463).jpg 136 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Jail 20 <br> indeed as far as I have been able to ob- <br> serve the mounds of drift which occupy <br> so much of the valley up to Shrewsbury <br> consist mostly of such beds of sand and <br> gravel as occur at the base and the sum- <br> mit of Strethill the middle tough clay- <br> deposit being but slightly represented <br> In the cutting opposite Build was Abbey <br> and in the gravel-pits near the station <br> the clean sea-sand similar to that at the <br> base of Strethill is however readily dis- <br> tinguishable from the upper beds which <br> are greyer in colour and rather more <br> clayey in composition and may possibly <br> correspond with the middle beds of Stret- <br> hill though much less tenacious <br> Descending the river to Bridgnorth <br> and for the present confining our ob- <br> servations to the valley the drift as- <br> cends to an altitude of 170 feet above the <br> river which is here 30 feet below the <br> river at Buildwas or about 240 feet <br> above the sea On the east side of the <br> valley the drift is disposed in two well- <br> marked terraces their sides sloping at <br> an angle of 30° the lower at an alti- <br> tude of 43 feet above the valley-alluvium <br> and the higher 43 feet above the lower <br> terrace and at altitudes of 113 and 156 <br> feet above the sea <br> The exact correspondence in height of <br> these two successive terraces of erosion <br> is rather remarkable ; and as they have <br> all the appearance of old river-banks it <br> has been suggested by my friend the <br> Rev Mr Wayne of Wenlock that they <br> may mark two distinct periods of inter- <br> ruption in the elevation of the land ” a <br> supposition which is well sustained by <br> the structure of the crest of the upper <br> terrace a section of which in the St <br> James's gravel-pits exposes at one point <br> a regular pebble-ridge or estuary coast- <br> beach composed of rounded boulders <br> with but a slight intermixture of smaller <br> matter The bulk of these terraces con- <br> sists of an even and stratified inter- <br> mixture of gravel and small rounded <br> boulders derived from a great variety of <br> formations including the following ” <br> o <br> r« <br> pq <br> 2Q <br> <br> <br> Q <br> CM <br> «Jg <br> rOH3 <br> 5 S <br> o <br> P a <br> S3 «C t 36089377 111261 51125 Page 136 Text v 20 http //www biodiversitylibrary org/page/36089377 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 36089377 dc identifier http //biodiversitylibrary org/page/36089377 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 N02/12894969463 2015-08-26 16 52 09 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 | ||||
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