The BGS Lexicon of Named Rock Units — Result Details

Pottery Clays (Member)

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
Partial Type Section  Hanging Hill Farm Borehole, from 0 to 101.8m depth. 
Worssam, B C, 1977. The Hangingwall Farm (1970) Borehole, South Derbyshire Coalfield. Bulletin of the Geological Survey of Great Britain, 63. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: