The BGS Lexicon of Named Rock Units — Result Details

Lamancha Conglomerate Formation

Computer Code: LCHA Preferred Map Code: LCHA
Status Code: Full
Age range: Ludlow Epoch (SU) — Ludlow Epoch (SU)
Lithological Description: Purple and reddish brown conglomerates and breccias in a sandstone matrix, with pebbles and rounded boulders of local derivation, up to 0.4 m in diameter of wacke and local 'Haggis Rock'.
Definition of Lower Boundary: Unconformably overlies Ordovician rocks of the Southern Upland Terrane.
Definition of Upper Boundary: Not seen, as it is cut by the Southern Upland fault.
Thickness: At least 50 m thick.
Geographical Limits: The Peebles area of the Southern Uplands.
Parent Unit: Reston Group (REST)
Previous Name(s): Lower Old Red Sandstone Group (LORS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Lamancha, 4 km south-west of Leadburn, Peebleshire. Brown et al., 2001. 
Reference(s):
Brown, M A E, Smith, R A, and Aitken, 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S024