| 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, 68-74. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
