| Computer Code: |
HPA |
Preferred Map Code: |
HPA |
| Status Code: |
Full |
| Age range: |
Guadalupian Epoch (PUG)
— Lopingian Epoch (PUL) |
| Lithological Description: |
Anhydrite rock; translucent blue-grey and grey with a faint to well-marked, coarsely marbled appearance that results from an anastomosing (penemosaic) net of pale brown dolostone. |
| Definition of Lower Boundary: |
Sharp contact with underlying Ford Formation dolostone. |
| Definition of Upper Boundary: |
Gradational upwards passage into the overlying Roker Formation dolostone. |
| Thickness: |
To 150m. |
| Geographical Limits: |
Western parts of the Zechstein Sea basin; in northeastern England on the basinward (east) side of the Ford Formation reef-edge. |
| Parent Unit: |
Zechstein Group (ZG)
|
| Previous Name(s): |
Hartlepool Anhydrite [Obsolete Name and Code: Use HPA]
(-2247)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Offshore No. 2 Borehole, 6 miles north of Hartlepool coastguard station (Smith and Francis, 1967, pp. 152 and 313). |
| Reference(s): |
| 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. |
| Smith, D B and Francis, E A. 1967. Geology of the country between Durham and West Hartlepool. Memoir of the Geological Survey of Great Britain, Sheet 27 (England and Wales). |
| Marley, J. 1892. On the Cleveland and south Durham salt industry. Transactions of the North of England Institute of Mining and Mechanical Engineers, Vol. 39, p. 91 - 125. |
| Trechmann, C T. 1913. On a mass of anhydrite in the Magnesian Limestone at Hartlepool and on the Permian of south-eastern Durham. Quarterly Journal of the Geological Society of London, Vol. 69, p. 184 - 218. |
| Smith, D B, 1994. Geology of the country around Sunderland. Memoir of the British Geological Survey, Sheet 21, (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E021
E027
E033
E015
|
