The BGS Lexicon of Named Rock Units — Result Details

Barroway Drove Beds

Computer Code: BYD Preferred Map Code: notEntered
Status Code: Index Level
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: The Barroway Drove Beds comprise soft grey clays and silty clays which were deposited in salt marshes and shallow water brackish lagoons cut by a complex network of tidal channels and creeks,subsequently infilled with silts and fine grained sands. Rhizomes of the salt-tolerant reed Phragmites occur throughout the clays and thin mats of rotted,drifted stems of reeds and sedges are common at many levels. At outcrop the silts and fine-grained sands that infill the creeks form low sinuous ridges or 'roddons'.
Definition of Lower Boundary: The Barroway Drove Beds rest with disconformity commonlyon the Fen Lower Peat but also on the intertidal sands.They also rest unconformably on glaciofluvial sand and gravel and on bedrock.
Definition of Upper Boundary: The Barroway Drove Beds are generally overlain by the Nordelph Peat Member or the Terrington Beds.Where the Nordelph Peat is present the upper boundary is obvious, but where the peat is absent and the lithology very similar to the overlying Terrington Beds then the upper boundary is difficult to distinguish. The presence of rootlet remains is characteristic of theTerrington Beds and so may help identify the upper boundary of the Barroway Drove Beds.
Thickness: Up to about 12m
Geographical Limits: Fenland area of East Anglia.
Parent Unit: Fenland Formation (FEND)
Previous Name(s): Fen Clay (Godwin,1940);Butery Clay (Skertchly,1877) (-1408)
Alternative Name(s): Tidal Flat Deposits
Stratotypes:
Type Area  Area around the hamlet of Barroway Drove to the west of Downham Market. Gallois,1979 
Reference(s):
Gallois, R W, 1994. The geology of the country around King's Lynn and The Wash. Memoir of the British Geological Survey, Sheet 145 and part of 129 (England and Wales). 
Whitaker, W and Jukes-Browne, A J. 1899. The geology of the borders around The Wash: including Boston and Hunstanton. Memoir of the Geological Survey of England and Wales. 
Gallois, R W. 1979. Geological investigations for the Wash Water Storage Scheme. Report of the Institute of Geological Sciences, 78/19, 1-74pp. 
Gallois, R W. 1988. Geology of the country around Ely. Memoir of the British Geological Survey, Sheet 173 (England and Wales). 
Skertchly, S B J. 1877. The geology of Fenland. Memoir of the Gological Survey of Great Britain. 
Horton, A. 1989. Geology of the Peterborough district. Memoir of the British Geological Survey, Sheet 158 (England & Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E129 E128 E144 E145 E158 E159 E172 E173 E127 E116