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| Keywords: The Quarterly journal of the Geological Society of London (14072679621).jpg LOWER PALJLOZOIC ROCKS OF ANGLESEY <br> 573 <br> its entire distance from north to south and where seen they almost <br> invariahty dip away from it <br> TJie Treioriuerth Sijnclme see map fig 3 ” The recognition of <br> the three groups just descrihed will help us to work out the stra- <br> tigraphy of the band of Pala ozoie rocks between the central axis <br> and the western Holyhead area A few sections will throw some <br> light upon its structure As the beds lie in a basin and Treior- <br> werth is situated about midway between the two extremities of <br> the zone we may call it the Treiorwerth syncline <br> Section 1 from Llanfaelog to Tyivyn fig 4 ” Leaving the <br> granitoid axis we first come to grit which a little higher up <br> near Ty-ceryg yields OrtJiis and within 200 yards passes gra- <br> dually up into green conglomerate f with pebbles of granitoidite <br> and unrounded fragments of green shale the pebbles and fragments <br> being sometimes of great size A little to the south on the west <br> side of Llanfaelog this conglomerate is overlain by black shales <br> which are also well exposed along the shore of the bay to the south- <br> west All the dips hitherto seen are north-westerly Rock is <br> Fig 4 ” Section from Tyiuyn to Llanfaelog <br> Scale two inches to one mile <br> Llan- <br> faelog <br> f a c c <br> a Holyhead schist <br> a Grranitoid rock <br> / Pault <br> b Pebidian <br> c Palasozoic <br> covered for some distance to the west but reappears at the railway <br> near Orsedd-y-person South of the line there is a clear dip <br> to the south-east so that we seem to have come to the west <br> side of a syncline The rocks too are very similar to the grits and <br> conglomerates overlying the granitoid axis ; and in a quarry to <br> the north of the railway we find the same Ortliis in a green grit <br> overlain by conglomerate the rocks dipping to the north-east <br> From here we soon come to the Llanfihangel conglomerate in the <br> ridge at Tywyn This rock on the Survey map is lettered as <br> Carboniferous d with a query There is not however the <br> The n\imbers 1 to 6 in this and the following sections correspond with <br> the nulnbers on the map <br> t This end of the section agrees with part of one by Dr Hicks Quart Journ <br> Geol Soc vol xl p 193 <br> \ This may have been suggested by the apparent deriyation of the conglo- <br> merate from the metamorpMc rocks to the west originally supposed to be <br> Cambrian <br> Q J G S No 159 2q <br> S E 36941406 113697 51125 Page 573 Text 40 http //www biodiversitylibrary org/page/36941406 1884 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 40 1884 Geology Periodicals Smithsonian Libraries bhl page 36941406 dc identifier http //biodiversitylibrary org/page/36941406 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/14072679621 2015-08-26 05 57 02 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by Fæ using a script | ||||
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