The BGS Lexicon of Named Rock Units — Result Details

Strichen Formation

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 Unpublished PhD.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:
S097 S087 S087 S086