The BGS Lexicon of Named Rock Units — Result Details

Hagley Volcanic Formation

Computer Code: HGY Preferred Map Code: Hgy
Status Code: Pending Upgrade
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Volcaniclastic sandstones, breccias and wackes; mottled sandstones and shales.
Definition of Lower Boundary: Overlies Aldress Shale Formation.
Definition of Upper Boundary: Underlies Hagley Shale Formation.
Thickness: Not defined.
Geographical Limits: Not defined.
Parent Unit: Chirbury Group (CBY)
Previous Name(s): Hagley Volcanic Group [Obsolete Name And Code: See HGY] (HVG)
Hagley Ash (-315)
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
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: