The BGS Lexicon of Named Rock Units — Result Details

Exe Breccia Formation

Computer Code: EBR Preferred Map Code: notEntered
Status Code: Full
Age range: Cisuralian Epoch (PLC) — Cisuralian Epoch (PLC)
Lithological Description: A red breccia containing clasts from 30 - 100mm in diameter, in a silty sandy matrix, with cross-bedded and planar-bedded sandstone sets up to 3m thick. Breccia clasts include sandstone, slate and quartz porphry.
Definition of Lower Boundary: Overlies and interdigitates with the Dawlish Sandstone Formation, which is essentially a red sandstone in planar- or cross-bedded units with sparse pebble seams.
Definition of Upper Boundary: Disconformable with the overlying Exmouth Mudstone and Sandstone Formation, which comprises predominantly thick units of red-brown mudstone with sporadic sandstone beds.
Thickness: 85m
Geographical Limits: Newton Abbot District, Devon.
Parent Unit: Exeter Group (EXE)
Previous Name(s): Exe Breccia (-2165)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Disused quarry near Dawlish Warren, Devon. Selwood et al., 1984. Shows up to 9m of interbedded planar breccia units with planar-bedded red-brown sandstone. 
Partial Type Section  Cliffs bordering the Exe Estuary at Lympstone. Selwood et al., 1984. Section shows planar-bedded units dipping at 9 degrees, and striking at 059 degrees. Section thickness not recorded. 
Reference(s):
Henson, M R, 1971. The Permo-Triassic rocks of south Devon. Unpublished PhD Thesis, University of Exeter. 
Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E339