The BGS Lexicon of Named Rock Units — Result Details
Ilfracombe Slates Formation
| Computer Code: | IFS | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Givetian Age (DV) — Frasnian Age (DR) | ||
| Lithological Description: | Comprises, in descending order: Kentisbury Slates Member, Combe Martin Slates Member, Lester Slates and Sandstones Member and Wild Pear Slates Member. | ||
| Definition of Lower Boundary: | The lower boundary of the Ilfracombe Slates Formation is the base of the Wild Pear Slates Member. This has a conformable contact with the underlying Hangman Grits. | ||
| Definition of Upper Boundary: | The upper boundary of the Ilfracombe Slates Formation is at the top of the Kentisbury Slates Member. This has a conformable contact with the overlying Morte Slates. | ||
| Thickness: | Up to 545 m. | ||
| Geographical Limits: | none recorded or not applicable | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Ilfracombe Group
(ILFG)
Ilfracombe Beds (ILFB) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Coastal section between Ilfracombe and Combe Martin, north Devon. Inland, the outcrop extends along a north-west / south-east trend through Simonsbath [SS 7730 3920] and to the south-east. Evans, 1922. | ||
| Reference(s): | |||
| Edmonds, E A, Whittaker, A, and Williams, B J. 1985. Geology of the country around Ilfracombe and Barnstaple. Memoir of the British Geological Survey, Sheets 277 and 293 (England and Wales). | |||
| Holwill F J W. 1964. The coral fauna from the Ilfracombe Beds of north Devon. Proceedings of Ussher Society, Vol. 1, 00. 126-129. | |||
| Holwill F J W, House M R, Lane R, Gauss G A, Hendriks E M L and Dearman W R. 1969. Summer (1966) field meeting in Devon and Cornwall. Proceedings of the Geologists Association, Vol. 80, pp 43-62. | |||
| Evans, J W. 1922. The geological structure of the country round Combe Martin. Proceedings of the Geologists' Association, Vol.33, 201-228. | |||
| Evans J W and Stubblefield C J, 1929. Handbook of the geology of Great Britain. (London: Thomas Murby & Co.) | |||
| Phillips, J. 1841. Figures and descriptions of the Palaeozoic fossils of Cornwall, Devon and west Somerset. (London: Longman, Brown, Green and Longmans). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||