MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(12511999863).jpg (3200x1869) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: The Quarterly journal of the Geological Society of London (12511999863).jpg 166 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Apr 20 <br> The Snowdon igneous rocks can be fol- <br> lowed to Camedd Dafyd where certain <br> lower beds of trap come in interstratified <br> with bands of fossiliferous slates and sand- <br> stones ; these also form parts of Camedd <br> Llewelyn Most of these rocks may be <br> traced from Carnedd Llewelyn to Nant- <br> francon on the sides of the steep hill west <br> of Llyn Ogwen called Braich-du There <br> they dip easterly at a high angle and rise <br> again with a westerly dip in the great peak <br> of Y-Tryfan From thence they roll over <br> in a large anticlinal and form the heights <br> of Gallt-y-gogo on the south side of the <br> Bangor road within two miles of Capel- <br> Curig The two bands of slate that <br> separate the igneous mass into three cease <br> in the valley of the Llugwy and the trap <br> becomes one thick band This great band <br> of felspathic trap can then be traced by <br> Ffynnon Llugwy and Llyn Dulyn almost <br> to Conway It is broken here and there <br> by faults Its dip is invariably easterly <br> Above it on the east are beds of sandstone <br> slate and felspathic traps and ashes The <br> sandstones especially are often fossilife- <br> rous and contain the fossils common to <br> Snowdon and Bala These vvdth igneous <br> interstratifications extend with many con- <br> tortions to the vale of the Conway Their <br> finest development lies between Ffynnon <br> Llugwy and Llanrwst around Llyn Cwlyd <br> Llyn Crafnant and Llyn Geirionydd <br> Their position above the rocks of Y-Tryfan <br> and Carnedd Llewelyn proves them to be <br> the equivalents of the Snowdon traps and <br> ashes and their fossils are also the same <br> The calcareo- felspathic quality of some of <br> the ashy beds nearly resembles some of the <br> rocks of Snowdon and Y-Glyder-fawr The <br> slates and traps of Glyn Lledr two miles <br> south-west of Bettws-y-Coed dip under the <br> rocks that lie between Ffynnon Llugwy <br> and Llanrwst The Glyn Lledr rocks also <br> dip under those in the Dolwyddelan Valley <br> A reference to the published maps of <br> the Geological Survey shows that the <br> Snowdon trap bounds Nant Gwynant on <br> the east Together with the slates that <br> immediately underlie it it dips westerly <br> ft <br> 2 <br> ; P <br> s <br> s <br> - <br> s <br> ' – '4i <br> s a <br> a; <br> »-' <br> <br> ri3 <br> o <br> Ho <br> 00 <br> <br> – i <br> c <br> a <br> 5 <br> -a <br> u <br> <br> « <br> S <br> gi <br> o <br> -go <br> P rt 34983279 108767 51125 Page 166 Text v 9 http //www biodiversitylibrary org/page/34983279 1853 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 9 1853 Geology Periodicals Smithsonian Libraries bhl page 34983279 dc identifier http //biodiversitylibrary org/page/34983279 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-14 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12511999863 2015-08-27 09 52 12 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1853 Photos uploaded from Flickr by Fæ using a script | ||||
.jpg){kind=link}
