4-616: 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 . 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
8-724: Is equal to the lower part of the Mississippian series in the international geologic timescale of the ICS . The Dinantian is named for the Belgian city of Dinant where strata of this age occur. The name is still used among European geologists. Earlier terms for the Dinantian were Bernician from the Anglo-Scottish borderland, and Avonian (divided into upper (Kidwellian) and lower (Clevedonian) substages) from Kidwelly on
12-674: 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 . Remains of
16-554: The prehistoric shark † Cladodus elegans Newberry & Worthen, 1870 (braincase and a tooth) have been found in the Lower Limestone Formation. Dinantian Dinantian is the name of a series or epoch from the Lower Carboniferous system in western Europe between 359.2 to 326.4 million years ago. It can stand for a series of rocks in Europe or the time span in which they were deposited. The Dinantian
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