| Computer Code: |
FV |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Asbian Substage (CR)
— Brigantian Substage (CX) |
| Lithological Description: |
Basaltic lavas, commonly amygdaloidal and locally brecciated, hyaloclastites and tuffs with thin beds of limestone. |
| Definition of Lower Boundary: |
Not proven. |
| Definition of Upper Boundary: |
Overlain conformably, with the top marked by the sharp base of the lowest bed of dark limestone, commonly containing Girvanella or Saccamminopsis of the Monsal Dale Limestone Formation. |
| Thickness: |
Measured as 293m in the Fallgate Borehole, base not reached. |
| Geographical Limits: |
The eastern margin of the Derbyshire Dome, in the Peak District, around Ashover (SK 36). |
| Parent Unit: |
Peak Limestone Group (PKLM)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Fallgate Borehole (SK36SE/25) |
| Reference(s): |
| Aitkenhead, N, Chisholm, J I, and Stevenson, I P. 1985. Geology of the country around Buxton, Leek and Bakewell. Memoir of the British Geological Survey, England and Wales Sheet 111. |
| Ramsbottom, W H C, Rhys, G H and Smith, E G, 1962. Boreholes in the Carboniferous Rocks of the Ashover district, Derbyshire. Bulletin of the Geological Survey of Great Britian, No.19, p.75-142. |
| Aitkenhead, N, and Chisholm, J I. 1982. A standard nomenclature for the Dinantian formations of the Peak District of Derbshire and Staffordshire. Report of the Institute of Geological Sciences, No. 82/8. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E111
E112
|
