The BGS Lexicon of Named Rock Units — Result Details

Four Ashes Sand And Gravel Formation

Stratotypes:
Computer Code:	FASG	Preferred Map Code:	symb
Status Code:	Full
Age range:	Ipswichian Stage (QI) — Devensian Stage (QD)
Lithological Description:	Gravel with organic-rich horizons of peat and grey, peaty clay. Gravel is dominantly well-rounded sandstone derived from the Sherwood Sandstone Group.
Definition of Lower Boundary:	Sharp erosional and unconformable on bedrock (Sherwood Sandstone Group).
Definition of Upper Boundary:	Either the ground surface or sharp contact with lower surface of red, sandy gravelly clay of the Stockport Glacigenic Formation.
Thickness:	0.45 to 4.6m
Geographical Limits:	Four Ashes, Staffordshire and the immediate surrounding area.
Parent Unit:	Britannia Catchments Group (BCAT)
Previous Name(s):	Four Ashes Sands and Gravels [Obsolete Name and Code: Use FASG] (-2795) Four Ashes Sand And Gravel (-902)
Alternative Name(s):	none recorded or not applicable
Type Section	Former sand and gravel quarry on the north side of Saredon Brook, Four Ashes, Staffordshire. Morgan, 1973; Maddy, 1999.
Reference(s):
Morgan, A V. 1973. The Pleistocene geology of the area north and west of Wolverhampton, Staffordshire, England. Philosophical Transactions of the Royal Society of London, Series B, Vol.265, 233-297.
Maddy, D. 1999. English Midlands Chapter 3 in Bowen, D Q (Editor), A revised correlation of the Quaternary deposits in the British Isles. Geological Society Special Report, No.23.
Worsley, P. 1991. Glacial deposits of the lowlands between the Mersey and Severn rivers. 203-211 in Ehlers, J, Gibbard, P L and Rose, J (editors), Glacial deposits in Great Britain and Ireland.
Worsley, P. 2005. The Cheshire-Shropshire Plain. Chapter 5 in Lewis, C A and Richards, A E (editors), The glaciations of Wales and adjacent areas. (Logaston Press.)
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E153

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