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The Bodeidda Mudstone is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period. ... Various Contributors to the Paleobiology Database.
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. Most recently, this definition has been clarified as a matrix-supported carbonate-dominated rock composed of more than 90% carbonate mud (<63 μm) component .
It predominantly consists of thinly bedded mudstone. [1] The un-weathered form is blue/grey, and the yellow/orange is the weathered form, it is used in brickmaking . The formation was deposited in lagoonal , lacustrine and alluvial conditions that varied from freshwater to brackish . [ 2 ]
The term is based on the word "whet", which means to sharpen a blade, [3] [4] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
The Wadhurst Clay Formation is a geological unit which forms part of the Wealden Group and the middle part of the now unofficial Hastings Beds.These geological units make up the core of the geology of the High Weald in the English counties of West Sussex, East Sussex and Kent.
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.
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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 .