The BGS Lexicon of Named Rock Units — Result Details

Lochmaben Formation

Computer Code: LMN Preferred Map Code: LMN
Status Code: Full
Age range: Cisuralian Epoch (PLC) — Cisuralian Epoch (PLC)
Lithological Description: Red, irregularly bedded siltstone and fine-grained sandstone that may be cross-bedded. It includes beds of coarse-grained sandstone with well-rounded frosted grains in a fine matrix, slump structures, small gypsiferous nodules, breccio-conglomerate and near-horizontal gypsum-cemented veins.
Definition of Lower Boundary: Apparently conformable lithostratigraphical boundary with underlying coarse, red sandstone of "millet seed" grains of Corncockle Sandstone Formation as noted in the log of borehole NY08SE/1 at the Princes Street Dairy, Lochmaben.
Definition of Upper Boundary: Not seen; any rocks deposited over the Lochmaben Formation are no longer preserved.
Thickness: More than 54m proven in the Lochmaben Hospital Trial Borehole.
Geographical Limits: Lochmaben Basin, Dumfriesshire, southwestern Scotland [Southern Uplands].
Parent Unit: Stewartry Group (STEW)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Lochmaben OBS [Lochmaben Hospital Trial Borehole] NY08SE/1. Bedrock concealed under 36m superficial deposits. 54m of bedrock drilled, to a total depth of 90m. Cored intervals 49-52m, 53-55m, 65-67.8m and 80-83m; samples taken 49m, 49.6m,49.7m, 52.7m, 65.1m, 65.4m, 65.7m, 66.3m, 80.1m, 80.2m, 80.7m, 80.9m, 81.7m, 81.9m depth. 
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used: