| Computer Code: |
BRFA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Bedded, generally coarse-grained, pebbly volcaniclastic sandstone with interbeds of laminated fine-grained sandstone and siltstone. |
| Definition of Lower Boundary: |
At sharp upward change from eutaxitic lapilli tuff (Moorside Farm Formation) to bedded sandstone. |
| Definition of Upper Boundary: |
Overlain by Bleawath Formation; boundary at change to massive lapilli-tuff. |
| Thickness: |
13.5m (uncorrected for structural dip or borehole deviation from vertical). |
| Geographical Limits: |
Seen only in Sellafield BH No.2 (NY00SE/28) |
| Parent Unit: |
Borrowdale Volcanic Group (BVG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Nirex borehole No. 2, BGS Registered No. NY00SE/28, 1482.37 - 1495.83m below Rotary Table Elevation, 1417.17m-1430.63m below OD. |
| Reference(s): |
| Millward, D, Beddoe-Stephens, B, Williamson, I T, Young, S R, and Petterson, M G. 1994. Lithostratigraphy of a concealed caldera-related ignimbrite sequence within the Borrowdale Volcanic Group of west Cumbria. Proceedings of the Yorkshire Geological Society, Vol.50, part 1, 25-36. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
