The BGS Lexicon of Named Rock Units — Result Details

St Bernard Tuff Member

Computer Code: SBTU Preferred Map Code: SBT
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Varied, massive thick to thinly bedded sequence of graded volcaniclastic sandstones and siltstones and massive lithic-crystal tuff.
Definition of Lower Boundary: Not seen, probably on undivided beds of Charnwood Lodge Volcanic Formation. Member is characterised from latter by increased abundance of fine- to medium-grained, well-bedded lithologies.
Definition of Upper Boundary: Not seen.
Thickness: About 100m
Geographical Limits: Crags to east of Mount St. Bernard Monastery.
Parent Unit: Charnwood Lodge Volcanic Formation (CMCL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Crags to east of Mount St. Bernard Monastery. 
Reference(s):
Carney, J N, 1994. Geology of the Thringstone, Shepshed and Loughborough districts (SK41NW, SK41NE and SK51NW). British Geological Survey Technical Report WA/94/08. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E141