| 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 [Obsolete Name and Code: Use LYBV]
(-384)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Black Water, from eastern edge of the Blackwater Gabbro to King's Haugh. |
| 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(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
|
