The geology of the north Staffordshire coalfields

 
9781151848345: The geology of the north Staffordshire coalfields
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ... known that the southern margin of the North Staffordshire Coalfield presents the unusual phenomenon, in the Midlands, of a narrow dvke of igneous rock penetrating the later Carboniferous and Tnassic deposits. The small mass near Yarnfield is indicated on the 1-inch Survey map (72 S.W.), but Charles Darwin seems to have been the farst to notice its existence near the lodge gates of Butterton Park, and to have mentioned the fact to Sir Roderick Murchison. It was also known to Dr. Garner. The petrology was first described by Allportf and subsequently by Dr. TealLJ The fullest account has been furnished by Mr. Kirkby, who conclusively proved that the date of its intrusion must be postTriassic. Sir Thomas Wardle also noted it at Norton Bridge, the southernmost point at which it is yet known. Its resemblance to the intrusive rocks of Titterstone Glee and Rowley Regis has been commented on by Professor Watts, and the similarity of the coarser varieties of these igneous rocks to the Tertiary dolerite dykes of the north of Ireland, Scotland and the Isle of Man pointed out Stratigraphical.--The dyke appears at the surface only at widely separated intervals along a low ridge regardless whether this consists of rocks of Carboniferous or Triassic age,and becoming lost to sight when the ridge dies away. It would also appear to bear some relation to the Apedale Fault, the chief disturbance in the district, for the dyke is always roughly parallel with it from Butterton to a little north of Swynnerton, and swings to the east or west as the fault changes its direction. It will also be seen that at Swynnerton there are reasons to believe that it is dislocated by the branches of this fault. The most northerly point at which the dyke can be seen is in the road...

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