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| Keywords: The Quarterly journal of the Geological Society of London (12646256174).jpg 82 PROCEEDINGS OF THE GEOLOGICAL SOCIETY Feb 18 <br> fig 2 and are then succeeded by three tiers of a fine-grained mi- <br> caceous stone containing more or less lime c This is the first <br> appearance of mica in the Middle Lias ; and from this horizon up- <br> wards it will be found to occur at intervals up to the highest of the <br> Upper Lias Sands The thickness of the blocks in the Three Tiers <br> as I have termed them varies much as does likewise that of the <br> intervening marl ; in the aggregate they measure from 20 to 26 feet <br> Above these in Westhay Cliff we find some 20 feet more of micaceous <br> marl 6 which is succeeded by Greensand a There is thus a <br> thickness of about 220 feet of Middle Lias in this hiU ; and the best <br> exposure of the beds is to be seen upon Westhay Cliff at and to the <br> eastward of a gully called Breakneck Prom this point to the <br> eastward the cliff decreases in height and the beds dip in the same <br> direction as far as a little stream called Ridge Water near which <br> a piece of broken swampy ground conceals a downthrow to the east <br> of about 40 feet This brings us to Gabriel's Water at which com- <br> mences the fine section of the Golden Cap <br> Fig 2 Vertical Section of the Middle Lias at Westhay Cliff <br> feet <br> a Greensand chert and Drift about 180 <br> b Grey micaceous marl 16 to 20 <br> c The Three Tiers micaceous sandstone in <br> sandy micaceous shale and grey marl about 20 <br> d Grey marl not micaceous with thin ferru- <br> ginous seams and masses of pyrites 73 <br> e The Green Ammonite-beds nodules imbed- <br> ded in grey marls 18 <br> / Grey marl as above 15 <br> g The Belemnite-stone <br> h Grey shale and layers of marl <br> ft Grey marl 16 to 22 <br> k Grey Lias stone 12 to 18 <br> / Blue marl 32 <br> m Limestone with Belemnites ; Ammonites rari- <br> costatus in the lower beds <br> n Lower Lias 30 to 40 <br> 3 The Golden Cap The principal portion of this hill is based <br> upon the Belemnite-beds fig 3 and the marls immediately over <br> the beach are those containing the Green Ammonite-nodules Above <br> these the « Three Tiers are here finely developed and form a remark- 35328247 109632 51125 Page 282 Text v 19 http //www biodiversitylibrary org/page/35328247 1863 Geological Society of London NameFound Belemnites NameConfirmed Belemnites EOLID 4780330 NameBankID 4089090 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 19 1863 Geology Periodicals Smithsonian Libraries bhl page 35328247 dc identifier http //biodiversitylibrary org/page/35328247 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12646256174 2015-08-27 11 54 24 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1863 Photos uploaded from Flickr by FÊ using a script | ||||
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