| 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 [Obsolete Name and Code: Use WWM]
(-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): |
| 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. |
| 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). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
