| Computer Code: |
SCHE |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Guadalupian Epoch (PUG)
— Lopingian Epoch (PUL) |
| Lithological Description: |
The Scolt Head Formation consists of mudstones with interbedded anhydrite. Stringers of sandstone are locally present. The mudstones and siltstones are commonly dolomitic and anhydritic and usually red-brown, but locally grey or mottled with grey and pale green. They vary from soft to firm, laminated and subfissile to amorphous and waxy. The anhydrite beds vary from soft, white and amorphous to pale grey, microcrystalline or sucrosic. |
| Definition of Lower Boundary: |
The base of the Scolt Head Formation is characterized by a downward change from red-brown mudstones to buff dolomite of the Plattendolomit Formation. It normally corresponds to a downward decrease in gamma values and an increase in velocity. |
| Definition of Upper Boundary: |
The top of the Scolt Head Formation is normally characterized by a downward change from red-brown mudstones, siltstones and sandstones of the Bunter Shale Formation to white and pale grey anhydrite. It coincides with a sharp downward decrease in gamma ray values and an increase in velocity. |
| Thickness: |
The Scolt Head Formation attains a thickness of about 30 m. |
| Geographical Limits: |
The Scolt Head Formation is present in the South Hewett Shelf area, and forms a marginal facies to the Southern Permian Basin. Like the Edlington Formation in eastern England, the Scolt Head Formation is roughly coextensive with the flat shelf of the Z1 carbonates (Smith, 1980). |
| Parent Unit: |
Zechstein Group (ZG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
North Sea well 53/14- 1: 997.5-1024 m (3273-3359 ft) (Johnson et al., 1994). |
| Reference Section |
North Sea well 53/01- 2: 1562-1580 m (5125-5183 ft) (Johnson et al., 1994). |
| Reference(s): |
| Johnson, H, Warrington, G and Stoker, S J. 1994. 6. Permian and Triassic of the Southern North Sea. In: Knox, R W O'B and Cordey, W G (eds.) Lithostratigraphic nomenclature of the UK North Sea. British Geological Survey, Nottingham. |
| Smith, D B. 1980. The evolution of the English Zechstein basin. In: Fuchtbauer, H, and Peryt, T M (eds.) The Zechstein basin with emphasis on carbonate sequences. Contributions to Sedimentology 9, 7-34. |
| Smith, D B. 1989. The late Permian palaeogeography of north-east England. Proceedings of the Yorkshire Geological Society, Vol.47, 285-312. |
| Smith, D B, Harwood, G M, Pattison, J and Pettigrew, T H. 1986. A revised nomenclature for Upper Permian strata in eastern England. 9-17 in Harwood, G M and Smith, D B (editors). The English Zechstein and Related Topics. Geological Society Special Publication No.22. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
