| Computer Code: |
ASTR |
Preferred Map Code: |
SYMB |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Strongly layered, interbedded semipelite; garnetiferous pelite (locally with kyanite and/or staurolite); micaeous psammite. Locally cm-thin calc-silicate ribs. |
| Definition of Lower Boundary: |
Overlies the Scoor Pelite Formation (SCPE), likely with conformable contact. |
| Definition of Upper Boundary: |
Not exposed. |
| Thickness: |
c. 2100 m (minimum estimate - post-deformational thickness). |
| Geographical Limits: |
Ross of Mull, Isle of Mull, Inner Hebrides. |
| Parent Unit: |
Glenfinnan Group (GLEN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. |
| Holdsworth, R E, Harris, A L and Roberts, A M, 1987. The stratigraphy, structure and regional significance of the marine rocks of Mull, Argyllshire, west Scotland, Geological Journal, Vol.22, 83-107. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S043
|
