The BGS Lexicon of Named Rock Units — Result Details

Margie Formation

Stratotypes:
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 [Obsolete Name and Code: Use MARG] (-4781)
Alternative Name(s):	none recorded or not applicable
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, 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:
S038 S066 S066 S057 S038 S013 S066

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