| Computer Code: |
UFE |
Preferred Map Code: |
UFE |
| Status Code: |
Full |
| Age range: |
Bathonian Age (JN)
— Bathonian Age (JN) |
| Lithological Description: |
Pale to medium olive-grey, calcareous silty mudstone with thin highly calcareous mudstones or argillaceous limestones and (in Bath-Frome area), a seam of montmorillonite-rich clay (Fuller's Earth). |
| Definition of Lower Boundary: |
Top of the limestones of the Fuller's Earth Rock. |
| Definition of Upper Boundary: |
The base of the lowermost argillaceous limestone of the Wattonensis Beds Member (Frome Clay Formation) marked by an increase in shell-detritus. |
| Thickness: |
24 to 28 m in the Bath-Frome area, thin or absent between Baggridge and Purse Caundle, and 21 m in the Mappowder Borehole. |
| Geographical Limits: |
Bath district, south to the Dorset coast (at crop). |
| Parent Unit: |
Fuller's Earth Formation (FE)
|
| Previous Name(s): |
Middle Fuller's Earth Clay
(-588)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Purse Caundle Borehole ST71NW/7 (Barton et al., 1993). |
| Reference Section |
Winterborne Kingston Borehole SY89NW/1 (Penn, 1982). |
| Type Section |
Horsecombe Vale No.15 Borehole ST76SE/24 (Penn et al., 1979). |
| Reference(s): |
| 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, 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 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, 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. |
| Barron, A J M, Lott, G K, and Riding, J B. 2012. Stratigraphical framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf. British Geological Survey Research Report RR/11/06. |
| 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). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E313
E297
E281
E327
E341
E342
E343
|
