| Computer Code: |
LIA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Guadalupian Epoch (PUG)
— Lopingian Epoch (PUL) |
| Lithological Description: |
Pink-grey, finely crystalline and commonly unevenly laminated anhydrite with local discontinuous laminae of red-brown silty marl. |
| Definition of Lower Boundary: |
Drawn at base of anhydrite of the Littlebeck Formation where it rests on red siltstone of the Sleights Formation. |
| Definition of Upper Boundary: |
Drawn at upward passage from anhydrite to red-brown mudstones and siltstones of the Roxby Formation. |
| Thickness: |
Approx. 1 to 2 m. |
| Geographical Limits: |
Eastern England (Yorkshire Province). |
| Parent Unit: |
Zechstein Group (ZG)
|
| Previous Name(s): |
Top Anhydrite [Obsolete Name and Code: Use LIA, TPA]
(-2290)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Littlebeck (F3) Borehole, Littlebeck, near Whitby, North Yorkshire. |
| Reference(s): |
| Smith, D B, Brunstrom, R G W, Manning, D I, Simpson, S and Shotton, F W. 1974. A correlation of Permian rocks in the British Isles. Geological Society of London Special Report No. 5. |
| Pattison, J. 1986. A revised nomenclature for Upper Permian strata in eastern England. "In" Harwood, G M and Smith, D B. (Editors). The English Zechstein and Related Topics. Geological Society Special Publication No.22, 9-17. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
