The BGS Lexicon of Named Rock Units — Result Details

Raise Beck Volcaniclastic Member

Computer Code: RABK Preferred Map Code: RaBk
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Massive and bedded fine- to coarse-grained tuff, some volcaniclastic sandstone at top. There is some uncertainty over whether the rocks are primary pyroclastic or reworked and resedimented.
Definition of Lower Boundary: Indistinct contact with vitric (welded) tuff of the Thirlmere Tuff Member.
Definition of Upper Boundary: Sharply overlain by lapilli-tuff of the Lincomb Tarns Tuff Formation (undivided).
Thickness: 30 - 60m
Geographical Limits: North Lake District immediately east of Thirlmere.
Parent Unit: Lincomb Tarns Tuff Formation (LTA)
Previous Name(s): Raise Beck Member (-1132)
Alternative Name(s): none recorded or not applicable
Reference Section  Exposures along Whelpside Gill, Wythburn. 
Type Section  Exposures along Raise Beck, Wythburn. 
Woodhall, D G, 1998. The geology of the Wythburn, Thirlmere and Fairfield areas of the north-east Lake District. British Geological Survey Technical Report WA/98/07. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: