Computer Code: |
ARQ |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
Lithological Description: |
Quartzite, massive, coarse, pure. |
Definition of Lower Boundary: |
Overlies the Yell Sound Psammite Formation; (occurs at the base of the Mid Yell Psammite Formation), incoming of quartzite lithologies. |
Definition of Upper Boundary: |
Overlain by the remainder of the Mid Yell Psammite formation; incoming of predominant psammite lithology. |
Thickness: |
Unknown: strongly deformed. |
Geographical Limits: |
Shetland: Yell, Mainland; east of the Walls Boundary Fault. |
Parent Unit: |
Mid Yell Lens Formation (MYEL)
|
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. |
Flinn, D, 1994. Geology of Yell and some neighbouring islands in Shetland. Memoir of the British Geological Survey, Sheet 130 (Scotland). |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |