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| Keywords: The Quarterly journal of the Geological Society of London (13859687323).jpg T M'KENNY HUGHES OST THE GEOLOGY OE ANGLESEY <br> 21 <br> The beds from Pwllgoch to Caemawr are probably Arenig lower- <br> most Bala of some At Pwllgoch we have the ironstone so charac- <br> teristic of Arenig and at Caemawr we find Arenig Graptolites see <br> p 26 <br> Where the dykes cross the series at Llyseinion fig 3 sandy beds <br> begin to appear and near Yr efail newydd predominate over the <br> shales as seen in several large quarries near the road The low <br> ground S W of this by Plas Llandyfrydog may be partly due to <br> faulted broken rock ; for it is probable that for every fault I have <br> detected in this turf-covered ground I have missed 10 or may be 100 <br> The lowest sandstones seen pass down into the conglomerates of <br> y Eoel E N E of Llanerchymedd ; and south of y Eoel apparently <br> cropping out from below the conglomerate there are green chloritic <br> schistose rocks weathering olive and brown which are probably <br> part of the Bangor beds Pebidian There is no rock exposed in <br> the valley immediately south of this where the word Llanerchymedd <br> is engraved on the survey map There is probably a fault through <br> here with a downthrow on the south repeating the Cambrian con- <br> glomerates which can be traced from nearly west of Pen cefn through <br> the cottage near the junction of the roads from Plas Coedana and <br> Capel Penial and sweeping round north of the windmill and crossing <br> the road to Llanfihangeltre'rbeirdd obliquely are seen east of the <br> farm road leading to Tyddynbach resting with a sharp line of junc- <br> tion upon schists similar to those mentioned above as cropping out <br> from below the conglomerate on y Eoel see fig 3 Near Pen cefn <br> the conglomerates pass up into fossiliferous flaggy grits and sand- <br> stones see p 25 <br> Pig 4 ” Section from Mynyddmawr to Llanerchymedd and Pen cefn <br> Llanerchymedd <br> N E <br> Pen cefn <br> a Sandstone and subordinate shale <br> b Ashy -looking brecciated con- <br> glomerate <br> c Sandstone with subordinate shale <br> d Sandstone <br> e Grit with annelid-tubes <br> / Quartz-jasper conglomerate <br> g Archaean <br> If we now make a traverse from near Pen cefn mentioned above <br> S W about 1 mile to Mynyddmawr see fig 4 we leave the con- <br> glomerate and grit dipping westerly and crossing the valley that <br> runs south from Llanerchymedd find the brown sandstones in a <br> quarry near the n of Cerygydrydion dipping at about 75° still <br> westerly Near Cilgwyn however we find ourselves on the other <br> side of what is probably a broken synclinal and in a quarry near 36935746 113692 51125 Page 21 Text 38 http //www biodiversitylibrary org/page/36935746 1882 Geological Society of London NameFound Graptolites NameConfirmed Graptolites NameBankID 423327 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 38 1882 Geology Periodicals Smithsonian Libraries bhl page 36935746 dc identifier http //biodiversitylibrary org/page/36935746 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-15 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13859687323 2015-08-26 07 51 29 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1882 Photos uploaded from Flickr by Fæ using a script | ||||
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