| Computer Code: |
TOEF |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Massive, homogeneous, pumice-rich to pumice-poor eutaxitic and parataxitic lapilli-tuff with "autobrecciated" zones and basal lithic breccia. |
| Definition of Lower Boundary: |
At base of homogeneous welded lapilli tuff, at the base of the lithic rich basal breccia if it is present. This is the basal member of the Fleming Hall Formation; it rests on the Brown Bank Ignimbrite Formation. |
| Definition of Upper Boundary: |
At sharp upward change to pyroclastic breccia of the Sides Farm Member. |
| Thickness: |
155m in type section (120m - bh4; 150m in RCF3) |
| Geographical Limits: |
Sellafield boreholes Nos 2 (NY00SE/28), 4 (NY00SE/29), 5 (NY00SE/30, 10A (NY00SW/38), RCF1 (NY00SE/35), RCF2 (NY00SE/36), RCF3 (NY00SE/37), RCM1 (NY00SE/41), RCM2 (NY00SE/40) and RCM3 (NY00SE/39). |
| Parent Unit: |
Fleming Hall Tuff Formation (FLH)
|
| Previous Name(s): |
Town End Farm Member [Obsolete Name and Code: Use TOEF]
(-2493)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Sellafield borehole No5, BGS Registered No NY00SE/30 (736.95 - 892.42m below Rotary Table Elevation, 651.32 -806.79m below OD. |
| Reference(s): |
| Akhurst, M C, Chadwick, R A, Holliday, D W, McCormac, M, McMillan, A A, Millward, D, Young, B, Ambrose, K, Auton, C A, Barclay, W J, Barnes, R P, Beddoe-Stephens, B, James, J C W, Johnson, H, Jones, N S, Glover, B W, Hawkins, M P, Kimbell, G S, MacPherson, K A T, Merritt, J W, Milodowski, A E, Riley, N J, Robins, N S, Stone, P, and Wingfield, R T R. 1997. The geology of the west Cumbria district. Memoir of the British Geological Survey, Sheets 28, 37 and 47 (England and Wales). 138pp. |
| Beddoe-Stephens, B, and Millward, D. 2000. Very densely welded, rheomorphic ignimbrites of homogeneous intermediate calc-alkaline composition from the English Lake District. Geological Magazine, Vol. 137, 155-173. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
