| Computer Code: |
WPSL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, without ratification |
| Age range: |
Givetian Age (DV)
— Givetian Age (DV) |
| Lithological Description: |
Strongly folded and cleaved silvery grey slates with subordinate thin sandstones, siltstones and limestones, which are generally ferruginous and iron-stained. |
| Definition of Lower Boundary: |
The top part of the underlying Hangman Grits are comprised of alternations of grey silty shales and siltstones, with sandstone content decreasing upwards. The basal bed of the Wild Pear Slates is a limestone bed with many fossils of Myalina; the contact is conformable with the underlying Hangman Grits, but is locally faulted. |
| Definition of Upper Boundary: |
Obscured by folding and faulting, but likely to be gradational and conformable; estimated to be below the lowest thick sandstone of the overlying Lester Slates and Sandstones Member (a sequence of slates, sandstones, gritty sandstones, siltstones and mudstones). |
| Thickness: |
50 m. |
| Geographical Limits: |
North Devon; at Wild Pear Beach [SS 5822 4778] and to the east-south-east to the area around Voley [SS 640 460] and south-east to Parracombe; in the vicinity of Holworthy [SS 6815 4409] the Wild Pear Slates are faulted out. |
| Parent Unit: |
Ilfracombe Slates Formation (IFS)
|
| Previous Name(s): |
Wild Pear Beds
(WPEAR)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Wild Pear Beach, North Devon. 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.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E277
|
