| Computer Code: |
EKD |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Guadalupian Epoch (PUG)
— Triassic Period (T) |
| Lithological Description: |
[Obsolete: use ZG] Siltstone, anhydrite and saliferous marl. |
| Definition of Lower Boundary: |
Drawn at base of the Sleights Siltstone Formation where it rests conformably on the Sneaton Halite Formation. |
| Definition of Upper Boundary: |
Drawn at conformable upward passage from the Roxby Formation to the Sherwood Sandstone Group. |
| Thickness: |
Up to about 150m |
| Geographical Limits: |
Eastern England. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Eskdale No. 3 (Sleights) Borehole, near Whitby. |
| Reference(s): |
| Rayner, D H, and Hemingway, J E (editors). 1974. The geology and mineral resources of Yorkshire. (Leeds: Yorkshire Geological Society.) |
| 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. |
| Armstrong, G and others, 1951. The paragenesis of sylvine, carnallite, polyhalite and kierserite in Eskdale Borings Nos. 3, 4 and 6, north-east Yorkshire. Mineralogical Magazine, Vol. 29, Figure 2, No. 214, 667-689. |
| 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. |
| Stewart, F H, 1954. Permian evaporites and associated rocks in Texas and New Mexico compared with those of northern England. Proceedings of the Yorkshire Geological Society, Vol.29, p.185-231. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
