Earth:Clackmannan Group
| Clackmannan Group Stratigraphic range: Carboniferous | |
|---|---|
| Type | Group |
| Sub-units | Lower Limestone Formation, Limestone Coal Formation, Upper Limestone Formation, Passage Formation |
| Underlies | Coal Measures Group |
| Overlies | Strathclyde Group |
| Lithology | |
| Primary | sandstones, mudstones |
| Other | limestones, siltstones, ironstones, coal, seatrocks, fireclay |
| Location | |
| Region | Central Lowlands of Scotland |
| Country | United Kingdom |
| Type section | |
| Named for | Clackmannan (town) |
The Clackmannan Group is the name given to a suite of rocks of late Dinantian and Namurian age laid down during the Carboniferous period in the Midland Valley of Scotland.[1]
Description
The Group comprises a lower unit of coarse sandstones, siltstones, mudstone, and limestones with thin coals and ironstones known as the Lower Limestone Formation, an overlying sequence of similar rocks known as the Limestone Coal Formation, then an Upper Limestone Formation and at its top the sandstones of the Passage Formation. This last formation also includes fireclays, siltstones, mudstones, ironstones, coal and seatrocks.
The Clackmannan Group conformably overlays the rocks of the Strathclyde Group and underlays the Coal Measures, this latter boundary also being conformable. [2][3]
Paleontology
Remains of the prehistoric shark †Cladodus elegans Newberry & Worthen, 1870 (braincase and a tooth) have been found in the Lower Limestone Formation.[4]
See also
- Fossil Grove
References
- ↑ "Clackmannan Group". The BGS Lexicon of Named Rock Units. British Geological Society. http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=CKN. Retrieved 27 February 2014.
- ↑ British Geological Survey Research Report RR/07/01: Lithostratigraphical framework for Carboniferous successions of Great Britain (Onshore) Waters, C.N. et al 2007
- ↑ British Geological Survey 1:50,0000 scale geological map sheet (Scotland) 23W Hamilton
- ↑ The Braincase and Jaws of Cladodus from the Lower Carboniferous of Scotland. Michal Ginter and John G. Maisey, Palaeontology, March 2007, Volume 50, Issue 2, pages 305–322, doi:10.1111/j.1475-4983.2006.00633.x
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