The BGS Lexicon of Named Rock Units — Result Details
Caw Sandstone Formation
| Computer Code: | CWT | Preferred Map Code: | CwT |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Volcaniclastic sandstone and breccia, bedded, coarsening upwards. | ||
| Definition of Lower Boundary: | Base of volcaniclastic sandstone or breccia that overlies, with local unconformity, the Lickle Tuff Formation (Stickle Pike Tuff Member) rhyolitic tuff. | ||
| Definition of Upper Boundary: | Overlain by dacitic lapilli-tuff of the Lag Bank Tuff Formation. | ||
| Thickness: | 0 to 700m | ||
| Geographical Limits: | Confined within the Ulpha Basin. Main outcrop is on Caw (SD 230 944) extends south to Appletree Worth (SD 247 930), north to Grassguards Fault (SD 230 960) and west to Stickle Pike (SD 212 917), Cumbria. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Caw Tuffs [Obsolete Name and Code: Use CWT]
(-1469)
Caw Formation [Obsolete Name and Code: Use CWT] (-2732) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Caw, upper slopes of peak. | ||
| Reference(s): | |||
| Millward, D, Johnson, E W, Beddoe-Stephens, B, Young, B, Kneller, B C, Lee, M K, Fortey, N J, Allen, P M, Branney, M J, Cooper, D C, Hirons, S, Kokelaar, B P, Marks, R J, McConnell, B J, Merritt, J W, Molyneux, S G, Petterson, M G, Roberts, B, Rundle, C C, Rushton, A W A, Scott, R W, Soper, N J, and Stone, P. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, England and Wales, Sheet 38. | |||
| Mitchell, G H, 1956. (Undivided Lickle Rhyolites). The Borrowdale Volcanic Series of the Dunnerdale Fells, Lancashire. Liverpool and Manchester Geological Journal, Vol.1, p.428-449. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E038 | |||