| Computer Code: |
PTYC |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Duckmantian Substage (CB)
— Bolsovian Substage (CC) |
| Lithological Description: |
Interbedded thin coal seams, seatearth clays, siltstones and sandstones. |
| Definition of Lower Boundary: |
At the top of the Hill Farm Sandstone, or floor of P40 coal seam where Hill Farm Sandstone not present. |
| Definition of Upper Boundary: |
Unconformity at base of Etruria Formation, latter consisting of red-yellow mottled mudstone and siltstone. |
| Thickness: |
c.140m+ |
| Geographical Limits: |
The area between Swadlincote, Church Gresley and Moira, south Derbyshire. |
| Parent Unit: |
Pennine Upper Coal Measures Formation (PUCM)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Hanging Hill Farm Borehole, from 0 to 101.8m depth. |
| Reference(s): |
| Worssam, B C, Calver, M A and Jago, G, 1971. Newly discovered marine bands and tonsteins in the South Derbyshire Coalfield. Nature, Physical Science, Vol.232, 121-122. |
| Worssam, B C, 1977. The Hangingwall Farm (1970) Borehole, South Derbyshire Coalfield. Bulletin of the Geological Survey of Great Britain, 63. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E141
|
