The BGS Lexicon of Named Rock Units — Result Details

Feorlin Sandstone Formation

Computer Code: FEOR Preferred Map Code: notEntered
Status Code: Full
Age range: Late Cretaceous Epoch (KU) — Paleocene Epoch (GP)
Lithological Description: Slightly glauconitic sandstone with silicified chalk pebbles.
Definition of Lower Boundary: The lower boundary is unconformable on the Strathaird Limestone Formation when considered as the basal member of the Ben Iadain Mudstone Formation (Braley, 1990), or on the Gribun Chalk Formation or Morvern Greensand (Mortimore, Wood and Gallois, 2001) as a formation in its own right.
Definition of Upper Boundary: The upper boundary is conformable with the rest of the Ben Iadain Mudstone Formation (Braley, 1990) or questionably beneath the Clach Alasdair Conglomerate Member (Mortimore, Wood and Gallois, 2001).
Thickness: About 8.5 m is attributed to these beds at Caisteal Sloc nam Ban in the Wilderness on Mull.
Geographical Limits: Known from the island of Mull.
Parent Unit: Inner Hebrides Group (IHEB)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Feorlin Cottage at Carsaig, Mull. Mortimore et al. (2001). 
Reference Section  Caisteal Sloc nam Ban in the Wilderness on Mull. Mortimore et al. (2001). 
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 Unpublished PhD Thesis CNAA, Polytechnic SouthWest (now University), Plymouth. 
Hopson, P M. 2005. A stratigraphical framework for the Upper Cretaceous Chalk of England and Scotland, with statements on the Chalk of Northern Ireland and the UK Offshore Sector. British Geological Survey Research Report RR/05/01 102pp. ISBN 0 852725175 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable