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| Keywords: The Quarterly journal of the Geological Society of London (13889276030).jpg 570 C CALLAWAY OX THE ARCH AX AXD <br> Pig 1 Generalized Section across the Palcpozoic Roclrs of <br> XorLliern An-jlescy Scale one incli to the mile <br> o Granitoid Rocks f Conglomerate <br> h Pebidian c Palaeozoic G-rir <br> / Fault Shale <br> The blank space in the centre of the section is occupied bj black shales <br> probably frequently repeated by folding and sometimes reflexed <br> 2 There is the clearest proof that the Palaeozoic rocks have been <br> thrnst laterally by a powerful force from the north On the north <br> side of Porth-y-gwichiad fig 2 the shales have been fractured <br> by a reversed fault with a very low hade to the north and the <br> beds of the upper mass lie with a low northerly dip upon almost <br> vertical strata which at the top are bent over towards the south <br> This appears to be a case of an overfold converted into an overfault <br> by a continuance of the lateral pressure according to the principle <br> expounded by Prof Heim At Llanbabo similar evidence is to be <br> Pig 2 Overfault in Blach Shale on Forth-y-giiichiad <br> Scale about one inch to 50 feet <br> seen in a large quarry near the church In another quarry to the <br> east of the road a little north of Pferam-gyd the strata are <br> repeatedly broken by small horizontal faults the upper masses being <br> pushed a few inches to the south The presence of thin quartzose <br> seams renders the dislocations very clear <br> 3 In the black-shale section between Porth-y-gwichiad and <br> Porth-y-corwg there are suggestions though not actual proofs of <br> repetitions by folding In high cliffs the beds are sometimes seen <br> to form part of a sigmoid curve ; and though on the whole the <br> ' lechanismus der Gebirgsbildung ' Band i pp 220-223 See also a paper <br> by Prof Lapworth F G S in the ' Geological Magazine ' August 1S53 36941403 113697 51125 Page 570 Text 40 http //www biodiversitylibrary org/page/36941403 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 36941403 dc identifier http //biodiversitylibrary org/page/36941403 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 N02/13889276030 2015-08-26 05 52 52 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by FĂŚ using a script | ||||
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