| Computer Code: |
LFSI |
Preferred Map Code: |
LFS |
| Status Code: |
Full |
| Age range: |
Bolsovian Substage (CC)
— Bolsovian Substage (CC) |
| Lithological Description: |
Micro-ophitic olivine basalt and porphyritic microgabbro (dolerite). |
| Definition of Lower Boundary: |
Sharp boundary with either unaltered mudstone or coal of the Pennine Coal Measures Group. |
| Definition of Upper Boundary: |
Sharp boundary with either unaltered mudstone or coal of the Pennine Coal Measures Group. |
| Thickness: |
Up to 22 m thick, as proved in the Russell’s Hall No.19 Pit (SO99SW/71) [SO 9322 9028]. |
| Geographical Limits: |
Outcrops at Sandfield Bridge [SO 980 906], Cooper’s Bank [SO 918 904], Dibdale [SO 920 906; SO 929 905], London Fields [SO 929 905; SO 931 907] and Dudley [SO 946 898]. |
| Parent Unit: |
Dudley Basaltic Sill-and-vent-swarm (DUDB)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
London Fields near Dudley. No exposures described and proved in old borehole and shaft records. Described but not named by Whitehead and Pocock (1947). |
| Reference(s): |
| Whitehead, T H and Pocock, R W. 1947. Geology of the country around Dudley and Bridgnorth. Memoir of the British Geological Survey, Sheet 167. (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E167
|
