The BGS Lexicon of Named Rock Units — Result Details

Staddon Formation

Computer Code: STG Preferred Map Code: StG
Status Code: Full
Age range: Emsian Age (DE) — Emsian Age (DE)
Lithological Description: Medium to thick beds (1-4m) of fine- to medium-grained sandstone, thickening and coarsening upwards with thin interbedded grey mudstone and siltstone.
Definition of Lower Boundary: Faulted out: lower part of sequence adjacent to fault is transitional to slaty mudstone, thin sandstone beds and sporadic thin limestone beds of the Bovisand Formation.
Definition of Upper Boundary: Faulted out: Staddon Formation thrust over Saltash Formation.
Thickness: c.500m
Geographical Limits: Staddon Grit Formation mapped on Plymouth (348) Sheet. Known to occur between north Cornwall coast at Trenance Point and south Devon coast south of Berry Head.
Parent Unit: Meadfoot Group (MDT)
Previous Name(s): Staddon Grits (-2455)
Staddon Grit Of Trenance Point [Obsolete Name And Code: Use STG] (SGTP)
Meadfoot Beds And Staddon Grit [Obsolete Name And Code: Use MDT And STG] (MFSG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cliff section below Staddon Heights. Bovisand Bay to Jennycliff Bay. 
Reference Section  Cliff section. Sandway Cellars to Redding Point. 
Reference(s):
Ussher, W A E, 1891. The Devonian Rocks as described by De La Beche, etc. Transactions of the Royal Geological Society of Cornwall, Vol.II, 273-326. 
Leveridge B E, Holder, M T, Goode, A J J, Scrivener R C, Jones N S and Merriman, R J. 2002. Geology of the Plymouth and south-east Cornwall area. Memoir of the British Geological Survey, Sheet 348 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E335 E336 E348 E346 E349 E347 E350