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Map of Mercia Mudstone Group's outcrop (Triassic) in Wales and southwest England The Mercia Mudstone Group is an early Triassic lithostratigraphic group (a sequence of rock strata ) which is widespread in Britain, especially in the English Midlands —the name is derived from the ancient kingdom of Mercia which corresponds to that area.
A pile up to several hundred metres thick of Triassic sandstones, mudstones and siltstones underlies Wirral, Liverpool and the coastal plains to the north. The following sequence is encountered within Merseyside: Mercia Mudstone Group. Sidmouth Mudstone Formation (formerly 'Keuper Marl') Tarporley Siltstone Formation (formerly 'Keuper Waterstones')
More recently, however, [4] there has been the recognition that it is the Mercia Mudstone Group which is seen to thicken markedly into faults imaged on seismic data rather than the Sherwood Sandstone Group. This work demonstrates the Mercia Mudstone Group to be a syn-rift phase of deposition, with the fine grained nature of the sedimentary ...
A further presumed unconformity separates the breccia from the mudstones of the overlying Mercia Mudstone Group which underlie the larger part of the low ground between Exmoor and North Hill. At the top of the group is a 25m thickness of mudstones with gypsum referred to as the Blue Anchor Formation. Above this are around 12m thickness of ...
The Stafford Halite is known at subcrop as a member of the Sidmouth Mudstone Formation. A couple of outliers of the Blue Anchor Formation and overlying Westbury Formation occur south of Uttoxeter. Stratigraphically, these are assigned to the Mercia Mudstone and Penarth groups respectively.
A mudstone: few small components in a micritic matrix, width of picture is 32 mm. In the Dunham classification (Dunham, 1962 [11]) system of limestones, a mudstone is defined as a mud-supported carbonate rock that contains less than 10% grains.
The geology of the Bendricks consists primarily of mudstones, siltstones and conglomerates (Mercia Mudstone marginal facies) formed primarily by deposition of silt at the shoreline of a shallow muddy sea during the Early and Late epochs of the Triassic period.
Keuper marl is a former and now deprecated term for multiple layers of mudstone and siltstone of Triassic age which occur beneath parts of the English Midlands and neighbouring areas e.g. Cheshire, [1] Nottinghamshire, [1] Devon, eastern Worcestershire and northern Yorkshire.