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| Keywords: The Quarterly journal of the Geological Society of London (14052758156).jpg 542 <br> H HICKS 0 THE PEE-CA ilBETAN- <br> TDelonging to series c the basic tuffs c These lie in true order of <br> succession on the series c above described These tuffs are largely <br> made up of fragments of diabase as may be seen from IS'ote 36 <br> from a specimen from Carn-ar-wig and l ote 37 from the same <br> series east of Castell to the north ISTote 35 refers to the dark green <br> compact rock exposed at the old copper-mdne at Pen-maen-melyn ; <br> a much altered felspathic diabase To the east of Castell the <br> basic rocks become exposed in several rugged knolls ; other knolls to <br> the S E are found to consist of the schistose rhy elites and breccias <br> of series c In the line of the section fig 9 which is taken from <br> Castell in Eamsey Sound in an E S E direction to Porth-clais the <br> Cambrian conglomerates are shown reposing unconformably on the <br> basic series d They can be seen in this position in the field to the <br> east of Castell having between Ogfeydd-duon and this point a dis- <br> tance less than a quarter of a mile crept over the edges of a con- <br> siderable thickness of the Pre-Cambrian beds The unconformity <br> shown in fig 14 is most marked and it is perfectly evident that <br> Fig 14 ” Cliff-section hetiveen Castell and Ogfeydd-duon showing <br> unconformity of Cambrian on Pehidian <br> Cambrian <br> Pebidian <br> the conglomerates are constantly reposing in this area on different <br> members of the underlying Pebidian series Moreover we have <br> proofs in abundance here as in the sections near S un's Chapel in <br> St Bride's Bay to show that the Pebidian rocks were in their <br> present condition before the Cambrian rocks were deposited as <br> shown by the fragments contained m the latter Some of these are <br> mentioned in the Notes 65-70 Fragments of the basic tuffs d and <br> of the schistose rhyolites c are plentiful in the Cambrian con- <br> glomerates in these areas and many of the rolled pebbles of these <br> rocks are of large size <br> 6 Whitesand Bay Rhosson Clegyr Foig S c <br> In this area the rocks for the most part are like those described <br> in the section to the south fig 9 but higher beds of the Pebidian <br> become exposed as the Cambrian conglomerates are followed to <br> the north By a strange error the Cambrian conglomerates are <br> shown in the Director-General's map to strike inland at a distance <br> of more than a quarter of a mile to the east of Porth-seli while in 36941375 113697 51125 Page 542 Text 40 http //www biodiversitylibrary org/page/36941375 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 36941375 dc identifier http //biodiversitylibrary org/page/36941375 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 N02/14052758156 2015-08-26 05 56 23 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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