The BGS Lexicon of Named Rock Units — Result Details

Main Chert

Computer Code: MNC Preferred Map Code: MnC
Status Code: Pending Upgrade
Age range: Pendleian Substage (CE) — Pendleian Substage (CE)
Lithological Description: Sequence of chert, cherty limestone, limestone and mudstone in very variable proportions.
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: none recorded or not applicable
Geographical Limits: none recorded or not applicable
Parent Unit: Stainmore Formation (SMGP)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Wells, A J, 1955. The stratigraphy and structure of the Middleton Tyas-Sleightholme Anticline. Unpublished Ph.D. thesis, University of Durham. 
Wells, A J, 1957. The stratigraphy and structure of the Middleton Tyas-Sleightholme Anticline, North Yorkshire. Proceedings of the Geologists' Association. Vol.68. 231-254. 
Wells A J, 1955. The Development of chert between the Main (Great) and Crow limestones in North Yorkshire. Proceedings of the Yorkshire Geol. Soc, Vol.30. 177-196. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E040 E041