Computer Code: |
BDN |
Preferred Map Code: |
Bdn |
Status Code: |
Full |
Age range: |
Bathonian Age (JN)
— Bathonian Age (JN) |
Lithological Description: |
Calcareous mudstones with intervals of argillaceous limestone. NOTE: Map code 'Bdn' combines Bowden Way Beds with Acuminata Beds. |
Definition of Lower Boundary: |
Transition from dark olive grey fissile mudstone to calcareous mudstone. |
Definition of Upper Boundary: |
Transition from calcareous mudstone to shell-detrital mudstones of the Acuminata Beds. |
Thickness: |
11.6m (Type Section), 21.2m (Purse Caundle Borehole). |
Geographical Limits: |
Sherborne Park, Sherborne, Dorset, to Milborne Wick, Somerset. |
Parent Unit: |
Lower Fuller's Earth Member (LFE)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
British Geological Survey Purse Caundle Borehole (ST71NW/7), Church Farm, Purse Caundle , from 31.98m to 53.18m depth. Barton, and others, 1993. |
Type Section |
Old Bowden Way, Milborne Port, Somerset: track section below East Hill, Milborne Port. |
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. |
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). |
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 |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E313
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