Computer Code: |
BSF |
Preferred Map Code: |
BSF |
Status Code: |
Full |
Age range: |
Sheinwoodian Age (SS)
— Sheinwoodian Age (SS) |
Lithological Description: |
Mudstone, bedding-fissile, medium-dark grey, variously bioturbated, graptolitic. Sparse thin argillaceous limestone layers with shelly faunas. |
Definition of Lower Boundary: |
Not seen in type area but presumed to rest conformably on Llandovery Purple Shales. |
Definition of Upper Boundary: |
Overlain conformably (by rapid passage) by Aston Mudstone Formation. Unnamed dingle (SO 3038 9094). |
Thickness: |
May be 500m |
Geographical Limits: |
Southern and western surround of the Shelve Ordovician outcrops, ie the Camlad Valley. |
Parent Unit: |
Not Applicable (-)
|
Previous Name(s): |
Bromleysmill Shales Formation [Obsolete Name and Code: Use BSF]
(-4503)
|
Alternative Name(s): |
Coalbrookdale Formation
|
Stratotypes: |
Type Section |
Quarry and stream 300m south of road junction A488 and A489, [SO 332 917] at Bromleysmill. |
Reference Section |
Quarry and stream 300m south of road junction A488 and A489, (SO 332 917) at Bromleysmill. |
Reference(s): |
none recorded or not applicable |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E165
|