The Geology of the South Wales Coal Field volume 10
The Geology of the South Wales Coal Field volume 10
Geological Survey of Great Britain
The book The Geology of the South Wales Coal Field volume 10 was written by author Geological Survey of Great Britain Here you can read free online of The Geology of the South Wales Coal Field volume 10 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Geology of the South Wales Coal Field volume 10 a good or bad book?
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SurvJ, 1900, p. 47. 86 CHAPTER IX. CARBONIFEROUS ROCKS (CONTINUED). COAL MEASURES. INTRODUCTION. The small part of the coalfield which is included in Sheet '2'2 (, ) contains representatives of the Lower Coal Series and of the lower part of the Pennant Series. It forms part of the anthracitic region as far as regards the bulk of the coal contained in it, but is situated not far from the South Crop where all the seams lose their purely anthracitic diameter. The Pennant seams, in accordance with ...the general rule that the higher seams are the more bituminous in any one section, are the first to show the change, and have assumed the character of steam-coals in the region under dcscript ion. 1 The argillaceous ironstone which occurs as ' pins ' (bands) or 'balls' i nodules) in 'mine-ground' (shale with ironstone) was formerly more in demand than the coal, but none is now worked. The courses of mine-ground so frequently lie just above the seams of coal in the Lower Coal Scries, as to surest a definite sequence oi events, leading to the deposition ot lireclay, coal, shale with ironstone, in the order named.
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