| Computer Code: |
LAQU |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tournaisian Age (CT)
— Visean Age (CV) |
| Lithological Description: |
Thick bedded, clean coarse-grained silica-cemented quartz sandstones with very subordinate dark grey to black mudstones, commonly containing plant debris. |
| Definition of Lower Boundary: |
Not seen due to thrusting. |
| Definition of Upper Boundary: |
Not seen due to thrusting. |
| Thickness: |
Not known due to poor exposure and structure. |
| Geographical Limits: |
Between Otterham (SX 15 91) and Stoke Climsland (SX 36 74), north Cornwall. In the Otterham area (Sheet 322), the formation has been mapped as Crackington Formation (Mceown et al. 1973) and further investigation is needed to delimit the Formation. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Crackington Formation (Pars)
(-861)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Laneast Downs, north Cornwall. |
| Partial Type Section |
Quary on Laneast Downs. 10km west of Launceston, north Cornwall. Thick-bedded quartzites and subordinate mudstones from an unknown level in the Formation. |
| Reference(s): |
| 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. |
| Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. |
| 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). |
| Reid, C, Barrow, G, Sherlock, R L, MacAlister, D A and Dewey, H. 1911. The geology of the country around Tavistock and Launceston. Memoir of the Geological Survey of Great Britain, Sheet 337 (England and Wales). |
| British Geological Survey. 1993. Tavistock. England and Wales Sheet 337. Solid and Drift 1:50 000 Provisional Series (Keyworth, Nottingham: British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
