The BGS Lexicon of Named Rock Units — Result Details

Creag Innich Sandstone Formation

Computer Code: CISA Preferred Map Code: CISF
Status Code: Full
Age range: Ediacaran Period (AD) — Comley Series (EC)
Lithological Description: Metasandstone, arenite to quartz-arenite, grey to buff-grey, locally gritty.
Definition of Lower Boundary: Outgoing of dominantly semipelite or pelitic slaty lithologies or the outgoing of variable green to rusty weathering arenites, wackes and semipelites; incoming of cleaner, coarse-grained quartzose arenites.
Definition of Upper Boundary: Incoming of variable arenite, wacke and semipelitic lithologies, and more matrix-rich rocks in general.
Thickness: 1300m maximum (estimated, but considered to lens out laterally)
Geographical Limits: Currently only defined within Sheet 38e (aberfoyle), where it occurs locally on either side of the Aberfoyle Slate and the Loch Katrine Volcaniclastic Formation in synformal folds; similar lithology known from Ben Lomond.
Parent Unit: Southern Highland Group (SOHI)
Previous Name(s): Ben Ledi Grits (-652)
Alternative Name(s): none recorded or not applicable
Type Area  Open upland ground between Creag Innich and the Duke's Pass, northwest of Aberfoyle. 
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used: