The BGS Lexicon of Named Rock Units — Result Details

Camas Malag Formation

Computer Code: CSMG Preferred Map Code: notEntered
Status Code: Full
Age range: Hettangian Age (JH) — Hettangian Age (JH)
Lithological Description: The limestone unit infills a pre-existing palaeokarstic surface and comprises clasts of Ordovician limestone (Durness Group), within an early Jurassic, yellowish, crinoid-rich, micrite matrix.
Definition of Lower Boundary: Unconformable on a palaeokarstic surface eroded into Ordovician dolostones of the Durness Group.
Definition of Upper Boundary: Separated by a dolerite sill from overlying fissile mudstones and limestones of the Breakish Formation; Farris et al (1999) suggested that, apart from the sill, the sequence is conformable.
Thickness: <1 m.
Geographical Limits: Sea of the Hebrides Basin.
Parent Unit: Lias Group (LI)
Previous Name(s): none recorded or not applicable
Alternative Name(s): Breakish Formation
Stratotypes:
Type Section  Camas Malag, Loch Slapin, Skye. Steel et al., 1975. 
Reference(s):
Nicholson, R. 1978. The Camas Malag Formation: an interbedded rhythmite conglomerate sequence of probable Triassic age, Loch Slapin, Isle of Skye. Scottish Journal of Geology, Vol.14, 301-309. 
Steel, R J, Nicholson, R and Kalander, L. 1975. Triassic sedimentation and palaeogeography in Central Skye. Scottish Journal of Geology, Vol.11, 1-13. 
Farris, M A, Oates, M J and Torrens, H S. 1999. New evidence on the origin and Jurassic age of palaeokarst and limestone breccias, Loch Slapin, Isle of Skye. Scottish Journal of Geology, Vol.35, part 2, 25-29. 
Nicholson, R. 1983. Age of the Camas Malag Formation, Skye; reply. Scottish Journal of Geology, Vol.19, 127-128. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S071