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| Keywords: The Quarterly journal of the Geological Society of London (12684274743).jpg 1852 <br> WESTON ON PORTLAND <br> 117 <br> AVe must now refer to the contemporaneous Purbeck beds in tbe <br> Isle of Portland <br> Former sections have shown that the Isle of Portland dips away to <br> the S so that the high escarpment on the N diminishes to a mural <br> cliif very little elevated above the sea-level at the Bill This ex- <br> tremity I examined for the express purpose of determining whether <br> my suspicions of the extension of the Purbeck so far South which <br> my hurried visit in 1847 had led me to entertain were correct or <br> fallacious ; and I now found on its western side an unequivocal section <br> of the junction of the marine and freshwater strata as in the accom- <br> panying sketch <br> Fig 10 ” Section of part of the Cliff at the Bill of Portland <br> Shingle-bed <br> r Purbeck <br> Second Dirt-bed <br> Purbeck <br> First Dirt-bed <br> Purbeck <br> Valvata and Cyrena <br> Portland <br> Trigonice Pectines c <br> 7 Marine <br> 6 Alternations of terrestrial <br> and freshwater <br> 5 Terrestrial <br> 4 Freshwater <br> 3 Terrestrial <br> 2 Freshwater <br> 1 Marine <br> No 1 is the Portland formation It is quarried down to nearly <br> high water-mark and abounds from the lowest portions to within a <br> short distance from its junction with No 2 with remains of marine <br> lamellibranchiate molluscs The beds which are immediately below <br> the Purbeck in the northern part of the island are on the other hand <br> equally marked by a profusion of gasteropodous molluscs <br> No 2 This stratum is not very decidedly separated from No 1 <br> and its equivalent in the quarry containing such numerous casts and <br> impressions of gasteropods is Hthologically a bond fide portion of the <br> subjacent and unquestionable marine deposit The strata 1 and 2 <br> appear in situ to have been continuous and of common origin Prof <br> E Forbes has however in his valuable paper On the succession of <br> strata in the Dorsetshire Purbecksf clearly proved that there is no- <br> Trans Geol Soc 2nd Series vol iv pi 2 <br> t Rep Brit Assoc 1850 Transact Sect p 79 Edinb New Phil Journ vo-l xlix <br> 1850 p 311 35461119 109911 51125 Page 117 Text v 8 http //www biodiversitylibrary org/page/35461119 1852 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 8 1852 Geology Periodicals Smithsonian Libraries bhl page 35461119 dc identifier http //biodiversitylibrary org/page/35461119 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12684274743 2015-08-27 12 59 01 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1852 Photos uploaded from Flickr by Fæ using a script | ||||
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