Computer Code: |
BIAD |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Late Cretaceous Epoch (KU)
— Paleocene Epoch (GP) |
Lithological Description: |
Mudstone and siltstone, shaly and micaceous, red to purplish in colour but bleached white in places. Considered to be "argillised ash" by Mortimore et al., (2001). Organic-rich and sandy in lower part. |
Definition of Lower Boundary: |
The lower boundary is unconformable above an erosive contact with underlying conglomerates of the Clach Alasdair Conglomerate Member. |
Definition of Upper Boundary: |
The upper boundary is disconformable at a sharp contact beneath Paleocene lavas. |
Thickness: |
Some 2.5m at Allt na Teangaidh on Mull, about 1.9m at Feorlin tributary section [NM 5317 2225], 0.92 m at the type site on Beinn Iadain. |
Geographical Limits: |
Known from Morvern and the island of Mull. |
Parent Unit: |
Inner Hebrides Group (IHEB)
|
Previous Name(s): |
Upper Estuarine Series
(-697)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Beinn Iadain Section A of Braley (1990) in Morvern. See also Mortimore et al. (2001, 462-469). |
Reference Section |
Allt na Teangaidh on Mull. See Mortimore et al. (2001, 448-451). |
Reference(s): |
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.) |
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 |
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 Unpublished PhD Thesis CNAA, Polytechnic SouthWest (now University), Plymouth. |
Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |