The BGS Lexicon of Named Rock Units — Result Details

Osdale Formation

Computer Code: OSDA Preferred Map Code: notEntered
Status Code: Full
Age range: Paleocene Epoch (GP) — Paleocene Epoch (GP)
Lithological Description: Mugearite and basalt lavas. The initial work on this formation strongly implied that tholeiitic (sub-alkali) basalt dyke intrusion immediately post-dated the extrusive phase.
Definition of Lower Boundary: Overlies the Bracadale Formation and older lavas of the Skye Lava Group. Sporadic plant beds or plant fragments are locally present at the base of the unit.
Definition of Upper Boundary: Uppermost lava flow. Overlain by superficial deposits or landslide material.
Thickness: To 500m
Geographical Limits: Northern Skye.
Parent Unit: Skye Lava Group (SKYL)
Previous Name(s): Osdale Group (-4237)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Exposures west of Bracadale, island of Skye. Bell and Williamson, 2002. 
Reference(s):
Bell, B R and Williamson, I T. 2002. Tertiary igneous activity. 371-407 in Trewin N H (Editor), The Geology of Scotland, 4th Edition. [London: The Geological Society.] 
Anderson, F W and Dunham, K C. 1966. The geology of northern Skye. Memoirs of the Geological Survey of Great Britain, Scotland. Sheet 80 and parts of sheets 81, 90 and 91. Edinburgh, HMSO. 
Emeleus, C H and Bell, B R. 2005. British Regional Geology: the Palaeogene volcanic districts of Scotland (Fourth Edition). (Nottingham: British Geological Survey.) x + 214pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S080 S080 S081 S090 S091 S081