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Geological Magazine (Volume 23 )

Geological Magazine (Volume 23 )

Geological Magazine (Volume 23 ).cHenry Woodward
Geological Magazine (Volume 23 )
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Author: Henry Woodward
Page Count: 292 pages
Published Date: 13 Jan 2012
Publisher: General Books
Publication Country: Miami Fl, United States
Language: English
Format: eBook
ISBN: 9781234951054
File Name: Geological.Magazine.(Volume.23.).pdf
Download Link: Geological Magazine (Volume 23 )
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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1886. Not illustrated. Excerpt: ... ffo. XII.--DECEMBER, 1886. I.--On The Structure And Organisms Of The Lower LimeStone Shales, Carroniferous Limestone And Upper LimeStones Of The Forest Of Dean. By Edward Wetherbd, F.G.S., F.C.S., F.R.M.S. (PLATES XIV. & XV.) SIR ANDREW RAMSAY has described1 the Coal-fields of the Forest of Dean, Somersetshire, and Bristol as outliers of the great Coal-fields of South Wales; there is, however, a marked thinning out in the thickness of the Carboniferous rock in the Forest of Dean as compared with the development of those rocks in South Wales and Bristol. At Clifton, near Bristol, the total thickness of the Carboniferous Limestone is about 2900 feet, at the northern end ot the Forest of Dean Coal-field it is about 600 feet. Professor Edward Hull has given' a comprehensive idea of the several divisions of the Carboniferous series as represented by typical developments in England. He has divided the series into three divisions, which he has again subdivided into stages marked by letters. The following is Professor Hull's classification, but I have omitted details which do not concern this paper. The British Carroniferous Series. Beds In Descending Order. Essentially Fresh- i Stage G. Upper Coal-Measures, water and s Estuarine Beds. I Stage F. Middle Coal-Measures. ( Stage E. Gannister Beds (Phillips), or Lower Coal-measures. Essentially - Stage D. Millstone-grit Series. Coarse grits, flagstones, and Marine. DEGREES shales, with a few thin coal-seams. I Stage C. Yoredale Series. Shales and grits, passing dowul wards into dark shales and earthy limestones, f Stage B. Carboniferous Limestone. Massive Limstone, passing northwards into several beds, with intervening Essentially Marine, DEGREES shales and grits, except Stage A - Stage A. Lower Limestone Shales and Calciferous...

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