The BGS Lexicon of Named Rock Units — Result Details

Humphrey Head Limestone Member

Computer Code: HHDL Preferred Map Code: HHdL
Status Code: Full
Age range: Asbian Substage (CR) — Asbian Substage (CR)
Lithological Description: Limestone: dark grey, even-bedded packstone at base, passing up into thickly bedded grainstone, paler grey.
Definition of Lower Boundary: Contact of dark grey even-bedded packstone with underlying palaeokarstic surface cut in pale grey grainstones of undivided Urswick Limestone Formation.
Definition of Upper Boundary: Palaeokarstic surface at top of paler grey grainstones; rapid change to dark limestone and mudstone of Gleaston Formation above.
Thickness: 20m
Geographical Limits: South Cumbria.
Parent Unit: Urswick Limestone Formation (UL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Reference Section  Kents Bank Station, Grange-over-Sands. Section on foreshore. 
Type Section  Humphrey Head, Grange-over-Sands. Section on foreshore. 
Reference Section  Trowbarrow Quarry. Section in crags on east face of quarry: base marked 155m, top 163.60m. 
Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable