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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')
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 ...
English: A map of Mercia, made using information from OpenStreetMap, Hill 'An Atlas of Anglo-Saxon England' and Stenton, 'Anglo-Saxon England' Date: 15 July 2012:
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.
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 ...
Alderley Fault – The original map by Hull and Green showed a normal junction between the lower Keuper Sandstones of Alderley and the marl to the south west. A borehole driven in 1894 at Alderley Edge [NGR SK 84237819] proved Waterstones indicated the intervention of a fault between this position and the Keuper Sandstone to the east.
The oldest rocks exposed at or near the surface of Lincolnshire are the sandstones and mudstones of the early Triassic Sherwood Sandstone Group.Rocks from this and the overlying Mercia Mudstone and Penarth groups occur in the northwest of the county and along its western border but are generally concealed beneath a thick cover of recent deposits.