The BGS Lexicon of Named Rock Units — Result Details

Lockerbie Breccia Member

Computer Code: LBIE Preferred Map Code: LKBM
Status Code: Full
Age range: Cisuralian Epoch (PLC) — Cisuralian Epoch (PLC)
Lithological Description: Red-brown breccio-conglomerate interbedded with thin- to medium-bedded red sandstone. Lithic clasts have a distinctive local derivation and include reddened limestone, wacke sandstone, basic volcanic rocks, siltstone, mudstone and rounded quartz pebbles.
Definition of Lower Boundary: Overlies Silurian strata with a marked angular unconformity north and west of the town of Lockerbie.
Definition of Upper Boundary: Conformable lithostratigraphical boundary with the overlying undivided strata of the Hartfield Formation.
Thickness: Proven by site investigations to be more than 11m thick.
Geographical Limits: In the vicinity of Lockerbie, Lochmaben Basin, Dumfriesshire, southwestern Scotland [Southern Uplands].
Parent Unit: Hartfield Formation (HTFD)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Exposures in road cutting on the eastern side of the A74 north of Lockerbie. Brookfield, 1978. 
Reference(s):
Brookfield, M E, 1978. Revision of the Stratigraphy of Permian and Supposed Permian Rocks of Southern Scotland. Geologische Rundschau, Vol.67, p.110-143. 
Brookfield, M E. 1977. Field guide to the Permian rocks of Dumfries and Lochmaben basins. Transactions of the Dumfriesshire and Galloway Natural History and Antiquarian Society. Third Series, Volume L11, 1-16. 
Harkness, R. 1856. On the sandstones and breccias of the south of Scotland of an age subsequent to the Carboniferous period. Quareterly Journal of the Geological Society, Vol. 12, p.254-267. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S010