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  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. 
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. 
Reference(s):
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). 
Henson, M R, 1971. The Permo-Triassic rocks of south Devon. Unpublished PhD Thesis, University of Exeter. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E339