The BGS Lexicon of Named Rock Units — Result Details

Fuller's Earth Rock Member

Computer Code: FER Preferred Map Code: FER
Status Code: Full
Age range: Bathonian Age (JN) — Bathonian Age (JN)
Lithological Description: Bioturbated argillaceous limestones and calcareous mudstones with an abundant Ornithellid fauna.
Definition of Lower Boundary: A rapid upward transition from calcareous mudstones of the Lower Fuller's Earth Member into shelly, muddy limestone by increase of shell-detritus.
Definition of Upper Boundary: Decrease of shell-detritus into calcareous mudstones of the Upper Fuller's Earth Member.
Thickness: Typically 5 to 7m in North Dorset, locally 11m, thin or absent in west and south Dorset, 3 to 5m in Bath-Frome area; 5.25m in type section.
Geographical Limits: Bath area and southern Cotswolds to central Dorset.
Parent Unit: Fuller's Earth Formation (FE)
Previous Name(s): Milborne Beds (-2181)
Thornford Beds (-4041)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Goathill Quarry. 650m northwest of Goathill Church (see Bristow, C R, et al, 1995, p.38-39 for section). 
Type Section  Horsecombe Vale No.15 Borehole, Bath ST76SE/24 (Penn, I E, et al, 1979). 
Reference Section  Purse Caundle Borehole ST71NW/7 (Barton, C M, et al, 1993). 
Type Area  Bath, Somerset (William Smith c.1815; see Arkell, W J, 1933). 
Reference Section  Winterborne Kingston Borehole SY89NW/1 (Penn, I E, 1982). 
Reference(s):
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. 
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. 
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 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E313 E297 E281 E265 E312 E327 E341 E342 E343