The BGS Lexicon of Named Rock Units — Result Details

Bayston-Oakswood Formation

Computer Code: BAGP Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Coarse-grained purple sandstones and grits with subordinate purple mudstones, siltstones and at least three beds of conglomerate.
Definition of Lower Boundary: At the base of the Bayston - Oakswood Formation massive coarse purplish sandstone with small scattered pebbles rests unconformably upon purple and green shales and sandstones of the Portway Formation. The basal sanstone may reprent the dying out of the Haughmond Conglomerate, which forms the basal member of the Formation, overlying beds that might be equivalent to the Synalds Formation, in the Shrewsbury area.
Definition of Upper Boundary: Drawn at the conformable upward passage of massive sandstones of the Bayston - Oakswood Formation to more flaggy siltstones and laminated sandstones of the Bridges Formation.
Thickness: Averages c.1800m.
Geographical Limits: Within the Church Stretton district: Long Mynd towards Shrewsbury.
Parent Unit: Wentnor Group (YW)
Previous Name(s): Bayston-Oakwood Formation [Obsolete Code: Use BAGP] (YWO)
Bayston-Oakswood Group (-1327)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The north western area of the Long Mynd massif. 
Reference(s):
Greig D C, Wright, J E, Hains, B A and Mitchell, G H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoir of the Geological Survey, Sheet 166 (England and Wales). (London: H.M.S.O.). 379pp. 
Wright, J E, 1968. The geology of the Church Stretton area (Explanation of 1:25 000 Geological Sheet SO49). Institute of Geological Sciences. 
James, J H. 1956. The structure and stratigraphy of part of the Pre-Cambrian outcrop between Church Stretton and Linley, Shropshire. Quarterly Journal of the Geological Society, Vol.112, 315-337. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable