The BGS Lexicon of Named Rock Units — Result Details

Ashover Grit

Computer Code: ASG Preferred Map Code: notEntered
Status Code: Index Level
Age range: Marsdenian Substage (CZ) — Marsdenian Substage (CZ)
Lithological Description: Massive or cross-bedded, medium to coarse grained, often pebbly and feldspathic sandstone.
Definition of Lower Boundary: The base of the first main sandstone or sandstones above the Bilinguites Marine Band. If no Marine Bands are proved it is the base of the third (not all of the sandstones may be present) main sandstone or group of sandstones below the top of the Millstone Grit Group.
Definition of Upper Boundary: The top of the first main sandstone or sandstones below the Bilinguites Marine Band. If no Marine Bands are proved it is the top of the third (not all of the sandstones may be present) main sandstone or group of sandstones below the top of the Millstone Grit Group.
Thickness: Up to 213 m thick.
Geographical Limits: Derbyshire, Leicestershire, Nottinghamshire.
Parent Unit: Marsden Formation (MARSD)
Previous Name(s): Third Grit (-2568)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Smith, E G, Rhys, G H and Eden, R A. 1967. Geology of the country around Chesterfield, Matlock, and Mansfield. Memoir of the Geological Survey of Great Britain. England and Wales Sheet 112. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E125 E126 E111 E099 E142 E141