Grain size is up to 0.0625 mm (0.0025 in) with individual grains too small to be distinguished without a microscope.
mudstone | Whitby Mudstone Formation | Mercia Mudstone Group |
In March 1913, a fossil tooth from a Parastegodon (similar to the Stegodon genus) was found in what is now Yurigaoka 2-19 in the upper sedimentary layers of mudstone.
Around 200m of silty mudstone in the Exeter area rising to 275m thickness on the coast between Littleham Cove and Budleigh Salterton (type section).
Cretaceous strata recorded here has geological formations of sandstones and mudstones with several chalk clasts.
Dibothrosuchus was named in 1965 by D.J. Simmons based on a partial skull and skeleton collected by Father Oehler of Fu Jen Catholic University from mudstones near the village of Dawa.
The fossils came from a mudstone next to a river channel deposit, in Lithofacies Association II of the Deep River basin, part of the extensive Newark Supergroup, dated as pertaining to either the late Carnian or early Norian faunal stages of the Late Triassic.
It was discovered and collected in the tuffaceous siltstones and mudstones of the lower part of the Hanson Formation, in Mount Kirkpatrick.
The solid geology of the area comprises Silurian mudstone of the Borth Mudstone Formation, which are partially overlain by superficial deposits of glacial till (Devensian diamicton).
Its type locality is Papierschifer, which is in a shallow subtidal mudstone in the Papierschiefer Formation in the Ried district of Germany.
Syneresis cracks, cracks formed in mudstone by changes in the salinity of water
The Tassajara Formation consists of sediments ranging from brown to gray mudstone, andesitic sandstone, conglomerate, and minor bentonitic and pumiceous tuff.