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 -Mendip
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 Gurney Slade & Emborough
 The Nettlebridge valley
 Geology
 Rocks of Mendips
 Fossils
 Geological timescale
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  Minerals and mines
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  Stone as a resource
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 Quarrying & geodiversity
 Quarrying & the environment
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 Mendip caves
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 Biodiversity
  Flora and fauna
 Typical Mendip habitats
 Special Mendip habitats
 Horseshoe bats
 Appendix of names
 Biodiversity of western
 Mendip
 Biodiversity of eastern
 Mendip
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 Detailed site information
  Coal mining
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  East Mendip quarries
 Biodiversity of eastern
 Mendip
  West Mendip quarries
 Biodiversity of western
 Mendip
 Acknowledgements
 Site map
Ancient Environments
Silurian l Devonian l Carboniferous l Triassic l Jurassic

Life in the Late Carboniferous, 326 – 299 million years ago

In the Late Carboniferous, quartzitic sandstones spread across the Mendip area, ending the growth of the Early Carboniferous limestone succession. Eventually a vast delta was formed, stretching from Britain eastwards to Poland, crossed by a winding network of river channels, and colonised by lush swamp forests of giant tree ferns. Decaying plant remains formed thick peat deposits, and these were deeply buried, compacted, and transformed into coal.

At Kilmersdon and Writhlington, near Radstock, discarded rock from coal mining contains the exquisite remains (stems, foliage & seed pods) of fossil plants such as Lepidodendron and Calamites, and more rarely, insects. Unlike modern trees, there was no woody tissue to support these plants. Some grew as featureless trunks, only producing a tree-like crown of branches when fully mature. Others, such as Calamites, resembled the modern-day horsetails, but grew to perhaps 10 m in height.

Periodically, the sea flooded into the coal swamps, killing the vegetation and depositing thin beds of mudstone containing marine fossils. These are called 'marine bands', and are very useful for understanding the relative ages of coal-bearing rocks.
  Life in the Late Carboniferous

Each marine band contains particular fossils that allow its recognition, and are individually named, usually after a particularly characteristic fossil. Near Westbury-sub-Mendip, the Subcrenatum Marine Band has been recognised, characterised by the goniatite Gastrioceras subcrenatum. Goniatites resemble ammonites that inhabited the seas of the Jurassic and Cretaceous, but are more primitive, typically with globose shells and simplified ornamentation.

Life in the Early Carboniferous

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