The BGS Lexicon of Named Rock Units — Result Details

Whipton Formation

Computer Code: WPN Preferred Map Code: Wpn
Status Code: Full
Age range: Permian Period (P) — Permian Period (P)
Lithological Description: Reddish-brown silty, clayey, sand and weakly cemented sandstone, with some clayey silt, mudstone and breccia units.
Definition of Lower Boundary: Rests directly and unconformably on Crackington Formation (Namurian), except where local patches of basalt intervene. A marked hiatus is present between the basalts at 290 Ma, and the Whipton Formation at c.260 Ma.
Definition of Upper Boundary: Overlain mostly by Alphington Breccia; junction gradational over a vertical interval of about 10m, with upward passage into breccia. Overlain by Monkerton Formation around [SX 965 940].
Thickness: 20m (Ide area), 25m at least (Exeter City centre), c.60m (type section), 10m (Pinhoe [c.SX 970 943]).
Geographical Limits: Outcrop extends from near Ide [SX 885 900], eastwards and northeastwards through Exeter to Whipton.
Parent Unit: Exeter Group (EXE)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Stream section, western boundary of North Brook School, Whipton. Silty breccia and gritty clayey sand rest unconformably on the silicified iron- and manganese-stained surface of the Crackington Formation. 
Reference(s):
Scrivener, R C. 1984. Geological notes and local details for 1:10 000 Sheet SX99SW. British Geological Survey. 
Bristow, C R and Scrivener, R C, 1984. The stratigraphy and structure of the Lower New Red Sandstone of the Exeter district. Proceedings of the Ussher Society, Vol.6, p.68-74. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable