The BGS Lexicon of Named Rock Units — Result Details
Allt Mor Na H-Uamha Member
Computer Code: | TCAM | Preferred Map Code: | CAM |
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Status Code: | Full | ||
Age range: | Tonian Period (AT) — Tonian Period (AT) | ||
Lithological Description: | Cyclically interbedded "siltstones" and fine- to medium-grained cross-bedded sandstones (the "siltstones" actually consisting of siltstone and very fine- to fine-grained sandstone with subordinate mudstone); the fine- to medium-grained cross-bedded sandstone beds increase in abundance towards the top of the Member. | ||
Definition of Lower Boundary: | Upon the Diabaig Formation (TCD). Base [NM 4205 9722]: at the lowest thickly-bedded (>2 m), cross-bedded and/or convoluted fine- to medium-grained sandstone. | ||
Definition of Upper Boundary: | Overlain by the Scresort Sandstone member (TCAS). Top [NM 4108 9751]: the incoming of thickly-bedded, cross-stratified and/or convoluted coarse-grained sandstone (arkose) bed containing 'exotic' pebbles characteristic of the Applecross Formation. | ||
Thickness: | 415m. in type locality. | ||
Geographical Limits: | Inner Hebrides: Rum, Soay. | ||
Parent Unit: | Applecross Formation (TCA) | ||
Previous Name(s): | Bagh Na H-Uamha Shale [Obsolete Name and Code: Use TCDL, TCAM]
(-1221)
Rudha Na Roinne Grit [Obsolete Name and Code: Use TCAS, TCAM] (-1222) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Area | Type Area - Isle of Rum, Allt Mor Na H-Uamha [NM 420 972 to NM 411 975]. | ||
Reference(s): | |||
Black, G P and Welsh, W, 1961. The Torridonian succession of the Isle of Rhum. Geological Magazine, Vol.98, 265-276. | |||
Emeleus, C H. 1997. Geology of Rum and the adjacent islands. Memoir (sheet) of the Geological Survey of Great Britain (Scotland) (60). (The Stationery Office for the British Geological Survey.) 171pp. | |||
Stewart, A D. 2002. The later Proterozoic Torridonian rocks of Scotland: their sedimentology, geochemistry and origin. Geological Society Memoir. Vol. 24. (The Geological Society.) | |||
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: | |||
S060 |