The BGS Lexicon of Named Rock Units — Result Details

Winstow Mudstone Member

Computer Code: WWM Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Courceyan Substage (CF) — Courceyan Substage (CF)
Lithological Description: Black, siliceous and sooty mudstones.
Definition of Lower Boundary: The lower boundary is taken at the incoming of black, sooty and siliceous mudstones of the Winstow Mudstone Member above the purple, green and grey mudstones of the underlying Whiteway Mudstone Formation.
Definition of Upper Boundary: The upper boundary is taken at the incoming of interbedded green-grey and black cherts and siliceous mudstones of the Winstow Chert Formation above the black, sooty and siliceous mudstones of the Winstow Mudstone Member.
Thickness: To 14m
Geographical Limits: Between Chudleigh (SX 870 784) and Kingsteignton (SX 88 74), south Devon.
Parent Unit: Winstow Chert Formation (WCH)
Previous Name(s): Winstow Slate Member (-3147)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  South bank of a track near Winstow Cottages, Chudleigh, south Devon. A few metres of black siliceous mudstones of the lowermost part of the Winstow Mudstone Member overlie purple and green mudstones of the underlying Whiteway Mudstone Formation. House and Butcher 1973. Selwood et al. 1984. 
Reference(s):
Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). 
House, M R and Butcher, N E, 1973. Excavations in the Devonian and Carboniferous Rocks near Chudleigh, south Devon. Transactions of the Royal Geological Society of Cornwall, Vol.20, p.199-220. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable