Henry H. Simpson
Abstract
In Denbighshire the Marl follows the productive Middle Coal Measures and consists of from 400–1,100 feet of red, green, and variegated marls with occasional sandstones and towards the top thin Spirorbis limestone and other limestones, with here and there films of coal. It corresponds with the Etruria Marl of the North Staffordshire Coalfield.
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In Denbighshire the Marl follows the productive Middle Coal Measures and consists of from 400–1,100 feet of red, green, and variegated marls with occasional sandstones and towards the top thin Spirorbis limestone and other limestones, with here and there films of coal. It corresponds with the Etruria Marl of the North Staffordshire Coalfield.
Key concepts: Marl, Geology, Coal, Coal measures, Paleontology, Coal mining, Mining engineering, Archaeology