The BGS Lexicon of Named Rock Units — Result Details

Lower Fuller's Earth Member

Computer Code: LFE Preferred Map Code: LFE
Status Code: Full
Age range: Bathonian Age (JN) — Bathonian Age (JN)
Lithological Description: Olive-grey, silty, calcareous mudstones with thin intervals of argillaceous limestone and oyster-rich mudstones (9 divisions: see principal reference).
Definition of Lower Boundary: A rapid increase in shell-detritus in calcareous mudstones that pass into the uppermost limestone of the Inferior Oolite.
Definition of Upper Boundary: A similar increase in shell-detritus that passes into the massive limestones of the Fuller's Earth Rock.
Thickness: 12.85m in type section; 12.15m in Bath-Frome area, 68m in Purse Caundle Borehole and c.100m in South Dorset.
Geographical Limits: Bath area to English Channel; unit continues to Burford area, Oxon, but name used only where the Upper Fuller's Earth is also present.
Parent Unit: Fuller's Earth Formation (FE)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Horsecombe Vale No.15 Borehole, Bath. ST76SE/24 (Penn, et al, 1979). 
Reference Section  Winterborne Kingston Borehole. SY89NW/1 (Penn, 1982). 
Reference Section  Scarp slope between Milborne Port and Old Bowden Way (localities A-C, fig.19, Bristow, et al, 1995). 
Reference Section  Purse Caundle Borehole. ST71NW/7 (Barton et al, 1993). 
Reference(s):
Bristow, C R, Barton, C M, Freshney, E C, Wood, C J, Evans, D J, Cox, B M, Ivimey-Cook, H C, and Taylor, R T. 1995. Geology of the country around Shaftesbury. Memoir of the British Geological Survey, Sheet 313 (England and Wales). 
Cope, J C W (Editor) 1980b. A correlation of Jurassic rocks in the British Isles. Part Two: Middle and Upper Jurassic. Geological Society of London Special Report, No.15 
Penn, I E and Wyatt, R G, 1979. The stratigraphy and correlation of the Bathonian strata of the Bath-Frome area. Report of the Institute of Geological Sciences, No.78/22, 23-88. 
Penn, I E, Merriman, R J and Wyatt, R G, 1979. A proposed Type section for the Fuller's Earth (Bathonian) based on the Horsecombe Vale No.15 Borehole, near Bath, with details of contiguous strata. The stratigraphy and correlation of the Bathonian strata of the Bath-Frome area. Report of the Institute of Geological Sciences, No.78/22, 3-22. 
Penn, I E, 1982. Middle Jurassic stratigraphy and correlation of the Winterborne Kingston Borehole, Dorset. 53-76 in Rhys, G H, Lott, G K and Calver, M A (editors), The Winterborne Kingston Borehole, Dorset, England. Report of the Institute of Geological Sciences, No.81/3. 
Barton, C M, Ivimey-Cook, H C, Lott, G K, and Taylor, R T. 1993. The Purse Caundle Borehole, Dorset: stratigraphy and sedimentology of the Inferior Oolite and Fuller's Earth in the Sherborne area of the Wessex Basin. British Geological Survey Research Report, SA/92/01. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E313 E297 E281 E327 E341 E342 E343