noun
definition
A fine-grained sedimentary rock whose original constituents were clays or muds.
Examples of mudstones in a Sentence
The prevailing rocks are sandstones, mudstones and shales.
To the south-east of this region a narrow outcrop of Upper Llandovery, Wenlock and Ludlow sandstones and mudstones follows, uncomformably overlying the Llandeilo and Bala rocks, and dipping conformably under the Old Red Sandstone; they extend from Newbridge-on-Wye and Builth through Llangammarch (where there are mineral springs) towards Llandovery, while a tongue of Ludlow rocks brought up by faulting extends from Erwood on the Wye for 8 m.
Consisting of red sandstones, mudstones and conglomerates, they are inclined at high angles usually away from the granite massif and the encircling metamorphic rocks.
In other areas mudstones have been found with microfossil plant spores and one of the later sandstones near Cheadle has fossil footprints of reptiles.
In the Middle Devonian deeper water conditions have produced mudstones, thin limestones and slates which rarely yield fossils.
In general, Tertiary basalts rest unconformably and in faulted contact with cretaceous greensands and limestones or dark gray, fossil-bearing Jurassic mudstones.
The Upper Coal Measures outcrop between Halesowen and West Bromwich and largely comprise marls, red sandy mudstones and grits.
Upto 6 basaltic dikes intrude into these Triassic marls and mudstones.
The Waterloo mudstone Formation spans the Triassic Jurassic boundary, and comprises dark gray mudstones and shales, alternating with gray limestones.
In Russia and South Africa, gently deposited mudstones and limestones suddenly give way to massive dumps of pebbles and boulders.
The geology of much of the western half of Leicestershire is dominated by the red mudstones of the Triassic aged Mercia Mudstone Group.
The calcareous mudstones and limestones are rich in fossils.
In this area and at Lechlade, the Upper Thames Valley is floored by the gray mudstones of the overlying Upper Jurassic Oxford clay.
These marine mudstones are fossiliferous representatives of the Lower Jurassic or Lias.
These dark gray mudstones, gray to black shales and minor limestones contain ammonite and rare reptile fossils.
But the Blythesdale Braystone is a small local formation, unable to supply all the wells that have been sunk; and many of the wells derive their water from the Jurassic shales and mudstones.