| Computer Code: |
BKF |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Famennian Age (DA)
— Visean Age (CV) |
| Lithological Description: |
Greenish grey mudstones with scattered thin calcareous siltstones. Several lenticular units of locally shelly limestone up to 0.6m thick are present. The formation intertongues with the Boscastle Formation, two tongues being present on the north Cornish coast. |
| Definition of Lower Boundary: |
Lower boundaries with the Boscastle Formation are taken at the gradational appearance of green grey mudstones with thin calcareous siltstones and limestones of the Buckator Formation above the dark grey sandstones and mudstones of the underlying Boscastle Formation. |
| Definition of Upper Boundary: |
Upper boundaries with the Boscastle Formation are taken at the gradational appearance of dark grey sandstones and mudstones of the overlying Boscastle Formation above the green-grey mudstones, with thin calcareous siltstones and limestones of the Buckator Formation. |
| Thickness: |
35m+. Full thickness of formation not exposed. |
| Geographical Limits: |
Between Boscastle (SX 11 93) and Launceston (SX 33 85), north Cornwall. |
| Parent Unit: |
Teign Valley Group (TEVY)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Low cliff promontary on landslipped sea cliff, 500m southwest of Buckator, 3km northeast of Boscastle, north Cornwall. The section exposes the upper part of a tongue of Buckator Formation overlain by Boscastle Formation. The junction is said to be conformable by Selwood et al (1985) but was mapped as a low angle fault by Freshney et al (1972). The Buckator Formation comprises 35m of folded, green mudstones with two lenticular limestone units. The base of the tongue is not seen. |
| Reference(s): |
| 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). |
| Selwood, E B, Stewart, I J and Thomas, J M. 1985. Upper Palaeozoic sediments and structure in north Cornwall - a reinterpretation. Proceedings of the Geologists' Association, Vol.96, 129-141. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E323
E337
|
