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| Keywords: The Quarterly journal of the Geological Society of London (12895303584).jpg 152 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Feb 3 <br> This Crab rock as seen in the section is in some parts twenty <br> feet thick ; but its thickness is very irregular as it spreads over <br> the eroded edges of the Carboniferous Limestone It is seen not <br> only reposing unconformably upon the Carboniferous rocks but also <br> enclosing veins of haematite see fig 3 Another locality where <br> this breccia or Crab rock appears is St Helen's about half a <br> mile to the north of the Park cutting and immediately east from <br> the railway Here the Carboniferous Limestones have the breccia <br> also spread out upon their surfaces and into some of the open joints <br> which intersect the underlying strata the Crab rock has found its <br> way At Dalton the same relations occur Near the church the <br> Crab rock consisting of unaltered fragments of limestone cemented <br> together by a red matrix also covers over the Carboniferous strata <br> This Crab rock is well known to miners who have noticed that <br> where haematite occurs below it in the Ulverstone district the latter <br> is always in intimate relation to the former <br> Fig 3 ” Section from Park to Furness Abbey 11 mile <br> is r <br> Park <br> Breccia <br> 'Crab rock <br> Furness <br> Abbey <br> 12 12 1 3 <br> 1 Carboniferous Limestone <br> 2 Haematite <br> 3 Fault <br> 4 Corby Sandstone <br> With reference to the position of the Crab rock its mineral <br> characters lead to the conclusion that it is of like age with the lower <br> and unaltered breccias of Burrells west of Appleby ; for it possesses <br> none of the magnesian features appertaining to the higher breccias <br> Here therefore the lowest Permian rocks of the north-west of <br> England are seen ; and after the clear and unmistakeable natural <br> section at Barrowmouth under St Bees Head where the Lower <br> Permian is reduced to a few feet in thickness we have no occasion <br> to call in the agency of great denudation in the Furness district <br> In truth it is quite manifest that along the western flank of the <br> old slaty mountains of Cumberland we meet only with ridges or <br> patches of Carboniferous Limestone which with the exception of the <br> very partial breccias above described are at once surrounded by the <br> middle and higher members of the Permian group of which hereafter <br> d Hcematite in the Lower Permians ” The mode in which that <br> valuable ore of iron hcematite is found deposited in pre-existing <br> cavities of the Carboniferous formation and sealed up by Crab <br> rock is a matter of great geological interest Joints fissures and <br> caverns were doubtless formed in the older rocks antecedent to the <br> deposition of the Permian strata and in these the ores of iron so <br> widely diffused throughout the Permian rocks have in this portion <br> of the north-western region assumed the characters of haematite 36089393 111261 51125 Page 152 Text v 20 http //www biodiversitylibrary org/page/36089393 1864 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 20 1864 Geology Periodicals Smithsonian Libraries bhl page 36089393 dc identifier http //biodiversitylibrary org/page/36089393 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-03 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12895303584 2015-08-26 16 55 20 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1864 Photos uploaded from Flickr by Fæ using a script | ||||
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