The BGS Lexicon of Named Rock Units — Result Details

Delabole Member

Computer Code: DLBS Preferred Map Code: DlbM
Status Code: Pending Upgrade
Age range: Famennian Age (DA) — Famennian Age (DA)
Lithological Description: Bluish grey slate within the Tredorn Slate Formation.
Definition of Lower Boundary: Gradational with the Tredorn Slate Formation.
Definition of Upper Boundary: Gradational with the Tredorn Slate Formation.
Thickness: 30 to 50m (estimated structural thickness).
Geographical Limits: Isolated exposures in the vicinity of Delabole village, north Cornwall.
Parent Unit: Tredorn Slate Formation (TSL)
Previous Name(s): Penpethy Beds (-2152)
Delabole Slates (-3996)
Alternative Name(s): Lower Delabole Slate
Stratotypes:
Type Section  Delabole Slate Quarry, lowest part. Selwood, E B, et al, 1998. 
Reference(s):
Parkinson, J, 1903. On the geology of the Tintagel and Davidstow district, Quarterly Journal of the Geological Society,Vol.59,408-421. 
Selwood, E B, Thomas, J M, Williams, B J, Clayton, R, Durning, B, Smith, O and Warr, L N, 1998. Geology of the country around Trevose Head and Camelford. Memoir of the British Geological Survey, sheets 335 and 336 (England and Wales). 
Dewey, H, 1909. On Overthrusts at Tintagel (North Cornwall). Quarterly Journal of the Geological Society, Vol.65, 265-280. 
Freshney, E C, McKeown, M C and Williams, M. 1972. Geology of the coast between Tintagel and Bude. Memoir of the Geological Survey of Great Britain, part of sheet 322 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E336