The BGS Lexicon of Named Rock Units — Result Details

Kelman Hill Ultramafic Volcanic Member

Computer Code: KHUV Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Fine-grained pale green ultramafic rocks with abundant tremolitic amphibole, commonly fragmented/brecciated; and some metabasalts, aphyric but rarely pyroxene-phyric. Interbanded with greywacke grits and slaty to phyllitic pelites.
Definition of Lower Boundary: Base of lowest recognisable ultramafic sheet in the Blackwater Formation.
Definition of Upper Boundary: Top of highest recognisable ultramafic sheet in the Blackwater Formation.
Thickness: c. 400 to 500m (based on outcrop width with no allowance for probable folding).
Geographical Limits: 500m-wide outcrop extending from Meikle Firbriggs [NJ 355 293], across the Black Water and along the Deveron Valley to Burn of Succoth [NJ 428 358], Cabrach area, Moray District. 1:50 000 sheets 75E and 85E.
Parent Unit: Blackwater Formation (BLWR)
Previous Name(s): Part Of Ardwell Bridge Lavas (Informal) (-4119)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Kelman Hill, southeast flanks, from Bridgend to Bridge of Forleath. 
Reference Section  Black Water, King's Haugh. 
Reference(s):
MacGregor, S M A and Roberts, J L, 1963. Dalradian pillow lavas, Ardwell Bridge, Banffshire, Geological Magazine, Vol. 100, 17-23. 
Fettes, D J, Lesley, A G, Stephenson, D and Kimbell, S F, 1991. Disruption of Dalradian stratigarphy along the Portsey Lineament from new geological and magnetic surveys. Scottish Journal of Geology, Vol.27, 57-73. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S075