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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. It is frequently encountered in older literature as the Keuper Marl or Keuper Marl Series. [1]
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')
Mercia Mudstone Group / Blue Anchor Formation: Triassic: Mercia Mudstone Group / Keuper Waterstones Formation: Triassic: Mercia Mudstone Group / Tarporley Siltstone Formation: Triassic: Merevale Shales: Ordovician: Middle Calcareous Grit: Jurassic: Middle Chalk Formation: Cretaceous: Middle Headon Beds: Palaeogene: Middle Inferior Oolite ...
Mercia Mudstone Group. Tarporley Siltstone Formation (siltstones, mudstones and sandstones) including Retford Member (mudstones) Sherwood Sandstone Group. Chester Formation (pebbly sandstones) Lenton Sandstone Formation; Edlington Formation (mudstones and sandstones) [8] The sandstone is an aquifer providing a local water supply.
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 ...
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 ...
The name 'Mercia' is a Latinisation of an Old English word derived from the Mercian Old English, Merce, meaning "borderland". [29] The dialect thrived between the 8th and 13th centuries and was referred to by John Trevisa , writing in 1387: [ 30 ]
The sequence in County Durham is divided into Lower, Middle and Upper formations. Each of the three are dominated by mudstones but contain abundant sandstones and coal seams. Ironstone bands occur in the lower part of the sequence. At least eleven marine bands (shelly mudstones in general) occur within the Coal Measures. Of these, the ...