Computer Code: |
LADG |
Preferred Map Code: |
LAGF |
Status Code: |
Full |
Age range: |
Ediacaran Period (AD)
— Comley Series (EC) |
Lithological Description: |
Sandstone, pale buff to green-grey, clean to matrix-rich, coarse, locally gritty, interbedded with purple, grey and black slates. |
Definition of Lower Boundary: |
Outgoing of coarse, chloritic and feldspathic arenites and wackes (at the top of the Ben Ledi Grit Formation) and incoming of pale arenaceous sandstones. |
Definition of Upper Boundary: |
Incoming of abundant black slate with chert (at base of Borfrishlie Slate Formation); contact may be tectonic. |
Thickness: |
100-200m |
Geographical Limits: |
Ground southwest of Aberfoyle and west of the Loch Tay Fault zone, adjacent to the Highland Boundary Fault, through towards Loch Lomond. |
Parent Unit: |
Southern Highland Group (SOHI)
|
Previous Name(s): |
Achray Sandstone [Obsolete Name and Code: Use LADG]
(-4744)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Loch Ard Forest, Aberfoyle. |
Reference(s): |
Tanner, P W G, 1998. Geological mapping of uppermost Dalradian and Palaeozoic rocks, Aberfoyle, Sheet 38E. Minor contract report for Sheet 38E/Southern Highlands Project, unpublished. (Formation known as Loch Ard Transition Group in report). |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S038
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