The BGS Lexicon of Named Rock Units — Result Details

Chatsworth Grit

Computer Code: CHG Preferred Map Code: notEntered
Status Code: Index Level
Age range: Marsdenian Substage (CZ) — Marsdenian Substage (CZ)
Lithological Description: Fine to coarse grained, massive and cross bedded, locally pebbly sandstones, with minor interbedded mudstone and siltstone.
Definition of Lower Boundary: The first sandstone or sandstones above the Verneulites sigma or Bilinguites Marine Bands. If no marine bands have been proved, it is the base of the second main sandstone or sandstones below the top of the Millstone Grit Group.
Definition of Upper Boundary: The top of the first main sandstone below the Cancelloceras Marine Band. If no Marine Bands are proved it is the top of the second or third main sandstone below the top of the Millstone Grit Group. Where the Redmire Flags are present it is the third sandstone; Where the Redmire Flags are absent it is the second sandstone. It is normally at least 30m below the top of the Group.
Thickness: Up to 90 m thick.
Geographical Limits: South Yorkshire, Derbyshire, Nottinghamshire and Leicestershire.
Parent Unit: Marsden Formation (MARSD)
Previous Name(s): Rivelin Grit (RVG)
Second Grit (-1426)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Green, A H and others, 1878. Yorkshire Coalfield. Memoirs of the Geological Survey of Great Britain, p.27-33. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E125 E126 E099 E110 E111 E142 E141