The BGS Lexicon of Named Rock Units — Result Details

Speeton Beck Member

Computer Code: SPBK Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Albian Age (KA) — Albian Age (KA)
Lithological Description: Member comprises rhythmically bedded white and pink limestones and grey or red marls or calcareous clays. The colouration of the argillaceous beds is paler in the lower part, but reddening becomes darker up-sequence. The limestones become harder upwards and the clays become marly and nodular.
Definition of Lower Boundary: The boundary is placed at a change from marly limestone and seams of limestone of the Queens Rock Member into rhythmically bedded limestones, marls and clays.
Definition of Upper Boundary: The boundary is placed at the change from alternating white and pink limestones and clays up into nodular limestones (Dulcey Dock Member).
Thickness: 3.49m.
Geographical Limits: Recognised only on the Yorkshire coast near Speeton.
Parent Unit: Hunstanton Formation (HUCK)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Double Rocks to Red Cliff Hole, Filey Bay, Yorkshire [TA 1520 7516 to 1548 7510]. See Mirchell (1995). 
Reference(s):
Mitchell, S F. 1995. Lithostratigraphy and biostratigraphy of the Hunstanton Formation (Red Chalk, Cretaceous) succession at Speeton, North Yorkshire, England. Proceedings of the Yorkshire Geological Society, Vol.50, 285-303. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable