The BGS Lexicon of Named Rock Units — Result Details

South Brentor Formation

Computer Code: SBT Preferred Map Code: notEntered
Status Code: Full
Age range: Famennian Age (DA) — Tournaisian Stage (CT)
Lithological Description: Black, sandy micaceous slates and pale greenish grey slates with nodular limestones. Some thick siltstone and fine-grained sandstone horizons.
Definition of Lower Boundary: Thrust bounded.
Definition of Upper Boundary: Passes upwards into the Lydford Formation. Lithology changes to shale with breccia.
Thickness: More than 32m.
Geographical Limits: Area around South Brentor, East Dartmoor, Devon.
Parent Unit: Transition Group (Devonian-Carboniferous) (TRG)
Previous Name(s): South Brentor Beds (-3660)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  South Brentor Quarry Isaac, 1983. 
Reference(s):
Isaac, K P, 1983. The tectonic evolution of the eastern part of south-west England: Tectonothermal denudation and weathering histories. Unpublished PhD Thesis, University of Exeter. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E337 E338