The BGS Lexicon of Named Rock Units — Result Details

Ardalanish Striped Formation

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):
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S043