| Computer Code: |
WYSL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, without ratification |
| Age range: |
Famennian Age (DA)
— Tournaisian Age (CT) |
| Lithological Description: |
[Obsolete: use WWYM] Whiteway Slate consists predominantly of grey-black, green and purple slates that are locally calcareous and siliceous, and rarely sideritic. The Slates contain a rich planktonic fauna of ammonoids, ostracods and conodonts; benthic fauna include crinoid debris and brachiopods, among others; ammonoids are rare except in the nodule-rich facies of the Chudleigh escarpment. |
| Definition of Lower Boundary: |
Conformable with the underlying Luxton Nodular Limestone; the transition between this lithologies is marked by the change from nodular and laminated limestones of the Luxton Nodular Limestone to the predominance of grey-black, green and purple slates of the Whiteway Slates, which are locally calcareous and siliceous and rarely sideritic. |
| Definition of Upper Boundary: |
The upper boundary of the Whiteway Slate in the Ugbrooke Unit (i.e. the thickness of rock that is bounded by the Bickington Thrust in the north and the Ware Barton Thrust in the south) is taken to be below the lowest of the sooty black shales that are placed within the Winstow Slate; in the field this transition would be identified by the change from grey-black, green and purple slates of the Whiteway Slate (described in the lithology section above) to the siliceous and sooty shales of the Winstow Slate, the basal part of the Winstow Chert, (green or greyish green, black and purple cherts) which is not separately mappable. |
| Thickness: |
Up to 120 m. |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Whiteway Barton farmyard. Selwood and others, 1984. |
| Reference(s): |
| Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). |
| House M R, and Butcher NE. 1962. Excavations in the Devonian and Carboniferous rocks of the Chudleigh area, south Devon. Proceedings of the Ussher Society, Vol 1, 28-29. |
| House, M R and Butcher, N E, 1973. Excavations in the Devonian and Carboniferous Rocks near Chudleigh, south Devon. Transactions of the Royal Geological Society of Cornwall, Vol.20, p.199-220. |
| Ussher, W A E. 1913. Geology of the country around Newton Abbot. Memoir of the British Geological Survey, Sheet 339. (England and Wales). |
| Thomas, I. 1909. Notes on the trilobite fauna of Devon and Cornwall. Geological Magazine, Vol. 46, 193-204. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E339
|
