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Toggle the table of contents. Bodeidda Mudstone. ... The Bodeidda Mudstone is a geologic formation in Wales. ... Various Contributors to the Paleobiology Database.
The Penarth Group is a Rhaetian age lithostratigraphic group (a sequence of rock strata) which is widespread in Britain.It is named from the seaside town of Penarth near Cardiff in south Wales where strata of this age are exposed in coastal cliffs southwards to Lavernock Point.
The formation was deposited in lagoonal, lacustrine and alluvial conditions that varied from freshwater to brackish. [2] The clay alternates with other subordinate lithologies, notably hard red-weathering beds of ironstone , limestone ( Sussex Marble ) and sandstones, notably including the calcareous sandstone unit referred to as the Horsham ...
A mudstone is a siliciclastic sedimentary rock that contains a mixture of silt- and clay-sized particles (at least 1/3 of each). [5] The terminology of "mudstone" is not to be confused with the Dunham classification scheme for limestones. In Dunham's classification, a mudstone is any limestone containing less than ten percent carbonate grains.
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.
These lithologies often occur with subordinate amounts of pale grey silty mudstones, laminated siltstones, sandstones, conglomerate, shelly limestones and clay-ironstones. [2] When they become exposed to the elements at the surface, the mudstones often degrade over a short period of time and weather to yellowish brown and greenish grey clays.
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The Whitby Mudstone is a Toarcian (Early Jurassic; Falciferum-Bifrons in regional chronostratigraphy) geological formation in Yorkshire and Worcestershire, England. [1] The formation, part of the Lias Group , is present in the Cleveland and Worcester Basins and the East Midlands Shelf .