The BGS Lexicon of Named Rock Units — Result Details

Ordan Shuas Psammite Formation

Computer Code: OSHP Preferred Map Code: notEntered
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Mostly pale grey massive psammite intercalated with thin biotite-rich semipelite and pelitic layers, some quartoze psammite intervals. In parts slumped and channelled sedimentary structures are preserved.
Definition of Lower Boundary: Base of the fairly massive shelfal psammites in the Ordan Shuas (NN 702 957) - Creagan a Choin area (NN 703 955), south of Newtonmore, taken at the incoming of thick quartzose psammites with channels, cross-bedding and slumped sedimentary structures.
Definition of Upper Boundary: Not seen; cut out to the southeast by the Ericht-Laidon Fault
Thickness: c.500m
Geographical Limits: Newtonmore area, south of Ralia and between the Glen Truim and Ericht-Laidon faults.
Parent Unit: Glen Spean Subgroup (GRGS)
Previous Name(s): Moine Series (-4042)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Hills south of Newtonmore between Ordan Shuas and Creagan a Choin and along strike to Ordan Shios Leslie, A G et al., BGS Internal Report IR/03/048 
Reference(s):
1:10K Sheet NN69NE clean copied by S Robertson and A J Highton, 1999. 
Leslie, A G, Krabbendam, M and Smith, R A, 2003. Progress Report on the Geology of 1:50 k Sheet 64W (Newtonmore) British Geological Survey Internal Report, IR/03/048. 23pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable