| Computer Code: |
SN |
Preferred Map Code: |
Ss |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Semipelite with pelite and psammite (including greywacke) with subordinate quartzite, amphibolite, calc-silicate rocks and rare limestones. The calc-silicate rocks and limestones are characteristic. |
| Definition of Lower Boundary: |
Top of Aberdeen Formation, where dominantly psammitic and semipelitic lithologies pass up into lithologies dominated by semipelite but including psammite and pelite, greywacke, grits, calc-silicates and some limestones. |
| Definition of Upper Boundary: |
Incoming of lithologies dominated by psammites, greywackes and grits, but including conglomerates and very rare thin calc-silicate layers. |
| Thickness: |
Not known. |
| Geographical Limits: |
Eastern parts of Aberdeenshire between the eastern margin of the Insch Basic Intrusion and the eastern margin of the Strichen Granite. |
| Parent Unit: |
Tayvallich Subgroup (DBTV)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The area immediately east of the Strichen Granite and the town of Strichen, Aberdeenshire. |
| Reference(s): |
| Kneller, B C, Not published. The geology of part of Buchan. Unpublished PhD. thesis, 1988. University of Aberdeen. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S086
S097
S087
S087
|
