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Mudstone on east beach of Lyme Regis, England. Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds.Mudstone is distinguished from shale by its lack of fissility.
Mudstones, shales, lutites, and argillites are common qualifiers, or umbrella terms; however, the term mudrock has increasingly become the terminology of choice by sedimentary geologists and authors. The term "mudrock" allows for further subdivisions of siltstone, claystone, mudstone, argilite and shale. For example, a siltstone would be made ...
The Charmouth Mudstone Formation is a geological formation in England, dating to the Early Jurassic (Sinemurian–Pliensbachian). [1] It forms part of the lower Lias Group.It is most prominently exposed at its type locality in cliff section between Lyme Regis and Charmouth (alongside the underlying Blue Lias) but onshore it extends northwards to Market Weighton, Yorkshire, and in the ...
The formation consists of red-brown mudstones and siltstones in which gypsum/anhydrite occurs as beds, veins and nodules. It was formerly known as the 'Brooks Mill Mudstone Formation' in the Cheshire Basin (and named from a location near Nantwich ), as the 'Cropwell Bishop Formation' on the 'East Midlands Shelf' and as the 'Twyning Mudstone ...
Geological map of the Isle of Wight. The geology of the Isle of Wight is dominated by sedimentary rocks of Cretaceous and Paleogene age. This sequence was affected by the late stages of the Alpine Orogeny, forming the Isle of Wight monocline, the cause of the steeply-dipping outcrops of the Chalk Group and overlying Paleogene strata seen at The Needles, Alum Bay and Whitecliff Bay.
The Clogau Formation, a thickness of black mudstones, together with the late Cambrian age Maentwrog, Ffestiniog Flags and Dolgellau formations are assigned to the Mawddach Group. These too are largely turbidites though the Dolgellau Formation is a dark pyritic mudstone. The exposures of Cambrian age rocks along the park's northwestern boundary ...
Around 200 - 255m of silty mudstones between the coast near Exmouth north to Aylesbeare, beyond which it is not separately mapped. It includes numerous sandstone lenses which can be up to 30m thick. This sequence has been known by various names in the past including the Exmouth Sandstones, Exmouth Formation and the Exmouth Mudstone and ...
Overlying the Millstone Grit sequence is the thick Westphalian sequence of sandstones, mudstones and coal seams collectively referred to as the Pennine Coal Measures Group and which forms the Lancashire Coalfield, the western part of which extends into Merseyside. The youngest Carboniferous strata in the area are the non-productive (of coal ...