The BGS Lexicon of Named Rock Units — Result Details

Acton Scott Formation

Computer Code: ASGP Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Actonian Substage (OT) — Actonian Substage (OT)
Lithological Description: Grey rubbly micaceous silty mudstones with siltstone bands, in places orange-stained and weathering shaly.
Definition of Lower Boundary: Drawn at the base of the Acton Scott Formation where mudstone facies rest conformably on blocky and rubbly mudstones and siltstones of the Cheney Longville Flags.
Definition of Upper Boundary: Drawn at the conformable upward passage of the Acton Scott Formation where the division from the overlying Onny Shales has been based on palaeontological grounds because of difficulty differentiating.
Thickness: c.60m near Church Stretton to c.150m in the Caradoc (south) area.
Geographical Limits: Caradoc - Wrekin District, Shropshire.
Parent Unit: Not Applicable (-)
Previous Name(s): Acton Scott Group (-30)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  River Onny Valley, Shropshire. 
Reference(s):
Cobbold, E S, 1900. The Geology of the Church Stretton District, in Church Stretton, 1, Shrewsbury, 47. 
Pocock, R W and Whitehead, T H, 1948. British Regional Geology: The Welsh Borderland. 2nd Ed, p.51, British Geological Survey. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable