The BGS Lexicon of Named Rock Units — Result Details
Ugbrooke Sandstone Formation
| Computer Code: | UGST | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Brigantian Substage (CX) — Namurian Stage (CN) | ||
| Lithological Description: | Thick-bedded massive, grey, medium-to coarse-grained, locally pebbly and conglomeratic sandstones with impersistent thick units of pebble-cobble conglomerate, argillaceous sandstone and dark grey mudstones with thin sandstones and siltstones. Pebbly mudstones are also present. Conglomerate clasts include chert and granite. | ||
| Definition of Lower Boundary: | The base is taken at the incoming of dark grey and greenish grey mudstones with thin siltstones and fine- to coarse-grained sandstones of the Ugbrooke Sandstone Formation above the thin-bedded cherts, shales and limestones of the underlying Winstow Chert Formation. | ||
| Definition of Upper Boundary: | The upper boundary is taken at an angular unconformity, where fine grained glauconitic sandstone at the Upper Greensand Formation rests upon thick-bedded to massive, locally pebbly to conglomeratic sandstone of the Ugbrooke Sandstone Formation. | ||
| Thickness: | Not known, but at least 500m. | ||
| Geographical Limits: | Chudleigh (SX 870 784) and East Ogwell (SX 845 695) areas, south Devon. | ||
| Parent Unit: | Chudleigh Group (CHUD) | ||
| Previous Name(s): | Ugbrooke Park Sandstones
(-589)
Ugbrooke Park Beds [Obsolete Name and Code: Use UGST] (-1890) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Partial Type Section | Quarry in Ugbrooke Park, 0.75km west of Ugbrooke House, Chudleigh, south Devon. Section exhibits about 10m of thick-bedded sandstones in the middle of the exposed part of the Formation. Neither the top nor the base of the Formation are exposed. Selwood et al. 1984. | ||
| Reference(s): | |||
| Ussher, W A E. 1892. The British Culm Measures. Proceedings of the Somerset Archeological and Natural History Society, Vol.38, 111-219. | |||
| Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). | |||
| House, M R and Butcher, N E, 1973. Excavations in the Devonian and Carboniferous Rocks near Chudleigh, south Devon. Transactions of the Royal Geological Society of Cornwall, Vol.20, p.199-220. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E339 | |||