| Computer Code: |
BUSS |
Preferred Map Code: |
BM |
| Status Code: |
Full |
| Age range: |
Permian Period (P)
— Permian Period (P) |
| Lithological Description: |
Reddish brown mudstone, sandy mudstone and clayey fine-grained sandstone, weathering to clay, sandy clay, and clayey sandstone. Contains a mappable bed of fine-grained sandstone near Columbjohn (eg SX 963 995). |
| Definition of Lower Boundary: |
Base taken at upward change from coarse-grained pebbly sandstone to clayey sandstone and mudstone at type locality. |
| Definition of Upper Boundary: |
Overlain by sandstone of main part of Dawlish Sandstone. |
| Thickness: |
24.4m in a borehole [SX 9458 9788] at Huxham Barton; 50m at Bussel's Farm [SX 9529 9873], 1km north-east of Huxham; more than 69m in the Columbjohn Borehole [SX 9584 9964], a further 1km north-east. |
| Geographical Limits: |
Outcrop forms low-lying ground, much mantled by superficial deposits, between Stoke Canon [SX 940 980], Columbjohn [SX 960 999], and Francis Court Farm [SX 980 995]. |
| Parent Unit: |
Dawlish Sandstone Formation (DAS)
|
| Previous Name(s): |
Bussell's Mudstone Member [Obsolete Name and Code: Use BUSS]
(-3256)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Bussel's Farm, Stoke Canon. Borehole proved 'marl', sandy marl, 'marly sandstone'to 48.46m depth. No curated material available. |
| Reference(s): |
| Bristow, C R. 1983. Geology of Sheet SX99NE (Broad Clyst, Devon). Geological Report for DOE: Land Use Planning. (Exeter: Institute of Geological Sciences.) |
| Edwards, R A. 1987. Geological notes and local details for 1:10 000 Sheet, SS90SE, Silverton and Bradninch, Devon. (Exeter: British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
