The BGS Lexicon of Named Rock Units — Result Details

Margie Formation

Computer Code: MARG Preferred Map Code: SYMB
Status Code: Full
Age range: Caradoc Series (O4) — Ashgill Series (OA)
Lithological Description: Poorly sorted, feldspathic, gritty psammite with calcareous cement dominant in North Esk section, but grey-blue slates dominate in Margie Burn. North Esk section contains a 2m limestone ("Margie Limestone") at NO 5685 7330. Basal conglomerate with metabasalt clasts to 0.3m ("Green Conglomerate") at NO 5875 7315.
Definition of Lower Boundary: "Green Conglomerate" in North Esk section is unconformable on metabasalts of the North Esk Formation. All other contacts are faulted.
Definition of Upper Boundary: Not seen: contacts faulted.
Thickness: Southern belt in North Esk section is 500m wide. Exposed thickness in North Esk probably no more than 300m.
Geographical Limits: Occurs in several fault-bounded pods just north of the Highland Boundary Fault between Glen Sannox (Arran) and Garron Point (Stonehaven).
Parent Unit: Highland Border Complex (HBX)
Previous Name(s): Black Shale and Margie Grit [Obsolete Name And Code: Use MARG] (DCBM)
Margie Series (-4781)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  North Esk stream section from 600m west of The Burn to Rocks of Solitude. 
Partial Type Section  North Esk stream section 1 to 1.25km south of house at Auchmull. 
Reference(s):
Gould, D, 2001. Geology of the Aboyne district. Memoir of the British Geological Survey, Sheet 66W (Scotland). 
Barrow, G, 1901. On the occurrence of Silurian (?) rocks in Forfarshire and Kincardineshire along the eastern border of the Highlands. Quarterly Journal of the Geological Society of London, Vol.57, p.328-345. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S038 S066 S066 S057 S038 S013 S066