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):
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. 
Gould, D, 2001. Geology of the Aboyne district. Memoir of the British Geological Survey, Sheet 66W (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S066 S038 S066 S066 S057 S038 S013