The BGS Lexicon of Named Rock Units — Result Details

Fallgate Volcanic Formation

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