Publisher's Synopsis
Excerpt from Memoirs of the Geological Survey of Great Britain and of the Museum of Practical Geology: The South Staffordshire Coal-Field
The Carboniferous Limestone, either simple as a group of beds of pure limestone or complicated by being more or less inter stratified with shales and sandstones, extends from Derbyshire to the borders of Scotland with a mean thickness of probably feet at least; it re-appears as a simple limestone in North Wales, in Flintshire, and Denbighshire, and in the same form in South Wales and the adjacent parts of England, varying in thickness from 500 to feet. The Coal-measures of the South Welsh coal-field are certainly feet, even if they are not in some places feet, in aggregate thickness, and have a thick group of sandstone beds at the base, which may be called the Millstone Grit, as well as another higher up, known as Pennant Grit. But from underneath the Carboniferous Limestone, which forms the thick enamelled lining, as it were, of the basins of the South Welsh and Forest of Dean coal-fields, there rises on all sides a great group of red and brown sandstones and red marls, known as the Old Red Sandstone. This Old Red Sandstone forms whole mountains of feet in altitude (as the Vans of Brecon), and cannot in some places have a less aggregate thickness than about feet.
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