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| Keywords: The Quarterly journal of the Geological Society of London (13204569035).jpg 114 T M READE OX THE DEIFT-BEDS OF THE <br> At Brynker station a deep bed of this gravel a fig 29 is seen to rest <br> Fig 29 Section at Brynker Station <br> a Gravel <br> b Clay <br> upon a clay o which is to all appearance true Till It is quite evi- <br> dent that the esker-like mounds of gravel have been cut out of a vast <br> plateau of Drift Moel Tryfaen so celebrated for the marine shells first <br> found by Mr Trimmer on its summit is a rounded mound-like plateau <br> forming a spur of Snowdon It is evident that the Tryfaen gravels <br> are but an upward extension of those on the valley Lying on the <br> slate rock of the Dorothea Quarries Nantley valley in 1872 1 noticed <br> the following section fig 30 purple slaty drift 2 lying on the <br> slate rock 1 in a thin patch and over it laminated current-bedded <br> o-ravels overlain by a coarse gravelly drift 3 the total thickness <br> in the deepest part being about 45 feet <br> Fig 30 Section at Dorothea Quarries <br> 1 Slate rock 2 Purple slaty drift 3 Coarse gravelly drift <br> Ascending from Pen-y-Orredd you pass over the shoulder of <br> Tryfaen ; many sinkings for new quarries were being made which <br> showed a great thickness of drift There are no terraces on Tryfaen <br> At the Alexandra quarry just on the summit is a bed of current- <br> bedded laminated sand and gravel containing large boulders At <br> about 12 feet from the surface I took out a glaciated stone ; the rolled <br> gravel contains travelled granite and even flints The larger stones <br> appear to be local The Drift has been described by Lyell it lies <br> upon the eroded edges of the slate rock ; and from it Mr E D <br> Darbishire F Gr S collected the shells a list of which is given in the <br> table Part I of this paper The level is roughly 1400 feet above <br> the sea 36928695 113681 51125 Page 114 Text 39 http //www biodiversitylibrary org/page/36928695 1883 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36928695 dc identifier http //biodiversitylibrary org/page/36928695 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13204569035 2015-08-26 13 56 53 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by FĂŚ using a script | ||||
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