Exmoor Group
The Exmoor Group is a late Devonian to early Carboniferous lithostratigraphic group (a sequence of rock strata) in southwest England whose outcrop extends from Croyde in north Devon east across Exmoor to Minehead in west Somerset. The group comprises the following formations (in stratigraphic order, i.e., the oldest at the base and the youngest at the top) the:
- Pilton Mudstone Formation (Pilton Beds, Pilton Shales)
- Baggy Sandstones Formation (Baggy Beds, Marwood Beds)
- Upcott Slates Formation
- Pickwell Down Sandstones Formation
- Morte Slates Formation
- Ilfracombe Slates Formation
- Hangman Sandstone Formation (Hangman Grits)
- Lynton Formation (Lynton Beds, Lynton Slates)
| Exmoor Group | |
|---|---|
| Stratigraphic range: Emsian (Devonian) to Tournaisian (Carboniferous) | |
Hangman Sandstone Formation at Glenthorne Beach, 6 km W of Porlock Weir | |
| Type | Group |
| Sub-units | Lynton Formation, Hangman Sandstone Formation, Ilfracombe Slates (Formation), Morte Slates (Formation), Pickwell Down Sandstones (Formation), Upcott Slates (Formation), Baggy Sandstone Formation, Pilton Mudstone Formation |
| Underlies | Doddiscombe Formation of Teign Valley Group |
| Thickness | about 7000 m |
| Lithology | |
| Primary | mudstones, |
| Other | siltstones, sandstones, limestones, conglomerates |
| Location | |
| Region | England |
| Country | United Kingdom |
| Extent | north Devon to west Somerset |
| Type section | |
| Named for | Exmoor |
Each of these divisions has been given different names by different authors in the past including those shown in brackets above. Some that had been classed as 'formations' (or even in one case as a 'group') are now 'members'.
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