| Computer Code: |
TVF |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Visean Age (CV)
— Visean Age (CV) |
| Lithological Description: |
Poorly sorted green fine-to coarse-grained basaltic calcareous tuffs with subordinate agglomerates and recrystallised carbonate-rich basaltic lavas. A few thin pink limestones occur scattered throughout the Formation. |
| Definition of Lower Boundary: |
The lower boundary is taken at the sharp contact of tuffs, lavas and agglomerates of the Tintagel Volcanic Formation with the siltstone-striped mudstones of the underlying Barras Nose Formation. |
| Definition of Upper Boundary: |
The upper boundary is taken at the sharp contact of the finely banded dark to pale grey mudstones with thin siltstones of the overlying Trambley Cove Formation with the tuffs, lavas and agglomerates of the Tintagel Volcanic Formation. |
| Thickness: |
To 90 m. |
| Geographical Limits: |
Tintagel area (SX 06 89) to south of Launceston (SX 32 77), Cornwall. |
| Parent Unit: |
Teign Valley Group (TEVY)
|
| Previous Name(s): |
Volcanic Series [Obsolete Name and Code: Use TVF]
(-1877)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Cliff sections around Tintagel. Freshney, McKeown, and Williams, 1972. |
| Partial Type Section |
Crags on the north side of the road leading to the beach at Trebarwith Strand, 2 km south of Tintagel, north Cornwall. Section exposes about 70 m of tuffs with subordinate agglomerates overlying the mudstones of the Barras Nose Formation. Basal contact seen but upper contact not seen. |
| Reference(s): |
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| Dewey, H, 1909. On Overthrusts at Tintagel (North Cornwall). Quarterly Journal of the Geological Society, Vol.65, 265-280. |
| McKeown, M C, Edmonds, E A, Williams, M, Freshney, E C and Masson Smith, D J. 1973. Geology of the country around Boscastle and Holsworthy. Memoir of the British Geological Survey, sheets 322 and 323 (England and Wales). |
| 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). |
| Parkinson, J, 1903. On the geology of the Tintagel and Davidstow district, Quarterly Journal of the Geological Society,Vol.59,408-421. |
| 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: |
|
E322
E336
E337
|
