| Computer Code: |
NEM |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Dominantly a bedded sequence of coarse- to fine-grained sandstone with some siltstone; massive and bedded lapilli-tuff, pumice lapilli-tuff and tuff, particularly towards top of formation. |
| Definition of Lower Boundary: |
Not present in either borehole |
| Definition of Upper Boundary: |
Taken at the change from bedded volcaniclastic deposits to massive rhyolitic welded tuff (base of Sella Park Member of Yottenfews Formation). (Not present in borehole 14A). |
| Thickness: |
Sellafield borehole No.7A: 137m+ (not corrected for structural dip nor borehole deviation); Sellafield borehole No.14A: 166m+ |
| Geographical Limits: |
Sellafield boreholes 7A (NY00SE/36) and 14A (NY00NW/451). |
| Parent Unit: |
Borrowdale Volcanic Group (BVG)
|
| Previous Name(s): |
Newton Manor Formation [Obsolete Name and Code: Use NEM]
(-418)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Sellafield borehole No.7A, BGS Registered No. NY00SE/36, 771.5m - 1010.00m below Rotary Table Elevation, 718.44m - 956.94m 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 |
