The BGS Lexicon of Named Rock Units — Result Details

Trehills Sandstone Member

Computer Code: TSS Preferred Map Code: TsS
Status Code: Full
Age range: Frasnian Age (DR) — Famennian Age (DA)
Lithological Description: Medium- to fine-grained sandstone interbedded with mudstone and micaceous laminated siltstone.
Definition of Lower Boundary: Transitional to slaty mudstone of undivided Tavy Formation.
Definition of Upper Boundary: Transitional to slaty mudstone of undivided Tavy Formation.
Thickness: 50m
Geographical Limits: Restricted to Plymouth (348) Sheet, east of the River Tamar.
Parent Unit: Tavy Formation (TVY)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  River cliff. East bank of River Tavy. 
Reference(s):
Leveridge B E, Holder, M T, Goode, A J J, Scrivener R C, Jones N S and Merriman, R J. 2002. Geology of the Plymouth and south-east Cornwall area. Memoir of the British Geological Survey, Sheet 348 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E348