The BGS Lexicon of Named Rock Units — Result Details

Lochaline White Sandstone Formation

Computer Code: LAWS Preferred Map Code: LAWS
Status Code: Full
Age range: Turonian Age (KT) — Santonian Age (KS)
Lithological Description: Very pure white to pale yellow-brown well-sorted medium-grained quartz sandstone. Massive with laminated and shelly beds to base. Most comprehensively described by Humphries (1961) at its type-site.
Definition of Lower Boundary: The lower boundary is conformable (?) on the Morvern Greensand Formation, at the change from glauconitic calcareous sandstones upward into pure white quartz sandstone.
Definition of Upper Boundary: The upper boundary is unconformable beneath the Gribun Chalk Formation or Coire Riabhach Phosphatic Formation. At the upward change from pure quartz sandstone into hard chalk or glauconitic sand with phosphatic nodules.
Thickness: Up to 40 feet (12.2m) on the west side of Loch Aline, according to Humphries (1961).
Geographical Limits: Known from the Morvern district and the Isle of Mull.
Parent Unit: Inner Hebrides Group (IHEB)
Previous Name(s): Loch Aline Sandstone (-2890)
White Sandstone (-235)
Loch Aline White Sandstone (-4144)
Loch Aline Glass Sand (-354)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Alt na Teangaigh, Mull (Mortimore et al., 2001). See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference Section  One of three sections given in Braley (1990) at waterfalls around Loch Aline, Morvern district. See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference Section  Beinn Iadain, in the Morvern district. See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference Section  Auchnacraig Cliff, Mull (Braley, 1990). See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Type Section  Lochaline Mine adit section, Morvern. See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference Section  One of three sections given in Braley (1990) at waterfalls around Loch Aline, Morvern district. See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference Section  One of three sections given in Braley (1990) at waterfalls around Loch Aline, Morvern district. See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference Section  Beinn Iadain in the Morvern district. See Braley (1990) and Mortimore et al. (2001) for detailed successions at widely spaced exposures in western Scotland and adjacent islands. 
Reference(s):
Lowden, B, Braley, S, Hurst, A and Lewis, J, 1992. Sedimentological studies of the Cretaceous Lochaline Sandstone, NW Scotland. 159-162 in Parnell, J (editor), Basins on the Atlantic Seaboard: Petroleum Geology, Sedimentology and Basin Evolution. Geological Society of London Special Publication, No.62. 
Mortimore, R N, Wood, C J and Gallois, R W, 2001. British Upper Cretaceous Stratigraphy. Geological Conservation Review Series. No. 23. (Peterborough: Joint Nature Conservation Committee.) 
Braley, S M. 1990. The Sedimentology, Palaeoecology and Stratigraphy of Cretaceous Rocks in N.W. Scotland. Unpublished PhD Thesis CNAA, Polytechnic SouthWest (now University), Plymouth. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S043 S044