The BGS Lexicon of Named Rock Units — Result Details

Lynebain Basic Volcanic Member

Computer Code: LYBV Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Amphibolite/metabasalt, mostly aphyric, locally with fragmented pillow structures. Interbedded with greywacke grits and slaty to phyllitic pelites.
Definition of Lower Boundary: Base of lowest metabasalt of the Blackwater Formation. In most of area this coincides with the faulted and/or sheared lower boundary of the Blackwater Formation.
Definition of Upper Boundary: Base of lowest recognisable sheet of fine-grained ultramafic rock in the Blackwater Formation.
Thickness: c. 300 to 400m (based on outcrop width with no allowance for probable folding).
Geographical Limits: 500m-wide outcrop extending along NW side of River Deveron Valley and SE side of Black Water from 1 km S of Blackwater Lodge [NJ 3327] to opposite Tammies Burn [NJ 421 355], Cabrach area, Moray District. 1:50 000 sheet 75E and 85E.
Parent Unit: Blackwater Formation (BLWR)
Previous Name(s): Ardwell Bridge Lavas (-384)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Bridge of Ardgallie, down Linn Burn to River Deveron, along River Deveron via Mill of Lynebain to Gouls Burn, and up Gouls Burn for 120m. 
Reference Section  Black Water, from eastern edge of the Blackwater Gabbro to King's Haugh. 
Reference(s):
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. 
MacGregor, S M A and Roberts, J L, 1963. Dalradian pillow lavas, Ardwell Bridge, Banffshire, Geological Magazine, Vol. 100, 17-23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S075