Computer Code: |
GTWN |
Preferred Map Code: |
GF |
Status Code: |
Full |
Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
Lithological Description: |
Weakly gneissose semipelite and subsidiary psammite beds, calc-silicate and metacarbonate rocks. |
Definition of Lower Boundary: |
In part tectonic against underlying gneissose psammites and semipelites of Dava Succession - not seen. |
Definition of Upper Boundary: |
Transitional, with increasing sandy content, up into psammites of the Nethybridge Formation, but contact relations not well exposed. |
Thickness: |
max. 500m |
Geographical Limits: |
Mid Spey Valley around Grantown-on-Spey, Central Highlands of Scotland, sheet 74E. |
Parent Unit: |
Grampian Group (GRAM)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
Dulnain Bridge - roches moutonees adjacent to A95 on it's north side. |
Type Area |
Laggan Hill to Wester Laggan Farm, NE of Dulnain Bridge. |
Reference(s): |
Highton, A J, 1999. Solid geology of the Aviemore district, Memoir for 1:50000 geological sheet 74E [Scotland]. London: The Stationery Office. 97pp. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S074
|