| Computer Code: |
ACU |
Preferred Map Code: |
Bdn |
| Status Code: |
Full |
| Age range: |
Bathonian Age (JN)
— Bathonian Age (JN) |
| Lithological Description: |
Shell-detrital mudstones with abundant Pracexogyra acuminata. NOTE: Map code 'Bdn' combines Acuminata Beds with Bowden Way Beds. |
| Definition of Lower Boundary: |
Transition from calcareous mudstone of the Bowden Way Beds to shell-detrital mudstone. |
| Definition of Upper Boundary: |
Transition from shell-detrital mudstone to argillaceous limestone (Fullers' Earth Rock). |
| Thickness: |
5.58 metres (Purse Caundle Borehole). |
| Geographical Limits: |
Central Dorset to Gloucestershire. |
| Parent Unit: |
Lower Fuller's Earth Member (LFE)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Ostrea Acuminata Beds
|
| Stratotypes: |
| Type Section |
British Geological Survey Purse Caundle Borehole ST71NW/7, Church Farm, Purse Caundle, 26.40 to 31.98m depth. |
| Reference(s): |
| 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. |
| Welch, F B A and Crookall, R, 1935. British Regional Geology. Bristol and Gloucester district 69. |
| Barton, C M. 1989. Geology of the Milborne Port district (Somerset and Dorset) 1:10 000 Sheet ST61NE. Technical Report of the British Geological Survey, Onshore Geology Series, WA/89/60 |
| 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). |
| Arkell, W J, and Donovan, D T. 1952. The Fuller's Earth of the Cotswolds and its relation to the Great Oolite. Quarterly Journal of the Geological Society of London, Vol. 107, 227-253. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E313
|
