Computer Code: |
SCPE |
Preferred Map Code: |
SYMB |
Status Code: |
Full |
Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
Lithological Description: |
Pelitic gneiss, garnetiferous; with abundant, deformed quartzo-feldspathic segregations. Thin layers of semipelitic gneiss and calc-silicate rock. |
Definition of Lower Boundary: |
Structurally overlying the Lagan Mor Formation (LAMO), but separated by a shearzone with intense mylonitisation. |
Definition of Upper Boundary: |
Overlain by the Ardalanish Striped Formation (ASTR), likely with conformable contact. |
Thickness: |
c. 80-300 m (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. |
Krabbendam M, Strachan R A, Prave A. 2021. A new stratigraphic framework for the early Neoproterozoic successions of Scotland. Journal of the Geological Society of London. doi:10.1144/jgs2021-054 |
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
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