The BGS Lexicon of Named Rock Units — Result Details
Upper Delabole Slates
| Computer Code: | UDSL | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full, without ratification | ||
| Age range: | Late Devonian Epoch (DU) — Late Devonian Epoch (DU) | ||
| Lithological Description: | Fine grained banded grey and buff slates; tough, with well eveloped cleavage. Feint iron-oxide spotting; elsewhere, cleavage planes are spotted by pyrite, chalcopyrite and pyrrhotite. Locally slates are weathered greenish grey; at some localities later crenulation cleavages are seen to cross the slaty cleavage. | ||
| Definition of Lower Boundary: | Conformable with the underlying Lower Delabole Slates; a sequence of dark grey slates which are seen to underlie the Upper Delabole Slates (greenish grey slates) in the Old Delabole Slate Quarry. | ||
| Definition of Upper Boundary: | Not exposed, but possibly is a conformable contact with the overlying Woolgarden Slates: a sequence of coarse-grained chloritoid-chlorite-mica-quartz slates with alternating bands of saccharoidal textured quartz and chlorite sericite. | ||
| Thickness: | Not known. | ||
| Geographical Limits: | North Cornwall, on the Boscastle sheet (322). To the south, the same rock type has been renamed as the Delabole Member of the Tredorn Formation. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Delabole Slates [Obsolete Name and Code: Use UDSL, TVY, DLBS, TSL]
(-3996)
Slaughterbridge Beds (SLBD) Delabole Slates [Obsolete Name and Code: Use UDSL, TVY, DLBS, TSL] (-3996) Slaughterbridge Beds (SLBD) |
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| Alternative Name(s): | Delabole Member |
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| Stratotypes: | |||
| Type Section | Delabole Slate Quarry. Selwood et al., 1998. | ||
| Reference(s): | |||
| Reid, C, Barrow, G and Dewey, H. 1910. The geology of the country around Padstow and Camelford. Explanation of sheets 335 and 336. Memoir of the British Geological Survey, England and Wales. | |||
| 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). | |||
| Dewey, H, 1909. On Overthrusts at Tintagel (North Cornwall). Quarterly Journal of the Geological Society, Vol.65, 265-280. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||