The BGS Lexicon of Named Rock Units — Result Details

Chirbury Group

Computer Code: CBY Preferred Map Code: Cby
Status Code: Pending Upgrade
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Shales, volcaniclastic members and sandstones.
Definition of Lower Boundary: Base of Spy Wood Sandstone Formation.
Definition of Upper Boundary: Top not seen - unconformity.
Thickness: >1500m, but poorly exposed.
Geographical Limits: Not defined.
Parent Unit: Not Entered (?)
Previous Name(s): Chirbury Formation [Obsolete Name and Code: Use CBY] (-4526)
Chirbury Series [Obsolete Name and Code: Use CBY] (-1416)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Chirbury area. 
Reference(s):
Lapworth, C . 1887. The Ordovician rocks of Shropshire. British Association for the Advancement of Science. Report for 1886. Birmingham Meeting 662. 
Whittard, W F. 1931. The geology of the Ordovician and Valentian rocks of the Shelve Country, Shropshire. Proceedings of the Geologists' Association, Vol.42, 322-344. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E165