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Clackmannan Group

Geologic formation in Scotland

Field	Value
name	Clackmannan Group
image	Fossil trail of giant Myriapod - geograph.org.uk - 993207.jpg
caption	Fossil trail of giant Myriapod, Limestone Coal Formation, Clackmannan Group
type	Group
age	Carboniferous
period	Carboniferous
prilithology	sandstones, mudstones
otherlithology	limestones, siltstones, ironstones, coal, seatrocks, fireclay
namedfor	Clackmannan (town)
region	Central Lowlands of Scotland
country	United Kingdom
subunits	Lower Limestone Formation, Limestone Coal Formation, Upper Limestone Formation, Passage Formation
underlies	Coal Measures Group
overlies	Strathclyde Group

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.

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.

Paleontology

Remains of the prehistoric shark †Cladodus elegans Newberry & Worthen, 1870 (braincase and a tooth) have been found in the Lower Limestone Formation.

References

"Clackmannan Group". British Geological Society.
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

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

geological-groups-of-the-united-kingdom geology-of-scotland fossiliferous-stratigraphic-units-of-the-united-kingdom carboniferous-system-of-europe carboniferous-scotland carboniferous-southern-paleotropical-deposits

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