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mudstone

mudstone

1 5.5
A hard rock that forms when mud or clay presses together and becomes solid
  • noun
  • /ˈmʌdˌstoʊn/
  • Specialized
translation icon : lutita
  • Shale, from an Old Norse word for "scale," is a fissile, laminated argillaceous mudstone (first defined technically in 1757).

Examples

  • The organic buildups are composed of massive to faintly laminated mudstone, wackestone, packstone, and boundstone.

    Blog text (19)
  • The egg site in the Patagonian badlands, above, is marked by bands of sandstone and mudstone.

    Academic text (2002)
  • We have sandstone, mudstone, basalt and slate.

  • The asphalt is cut through one after another of lime and mudstone rises rather than making a washboard of these last ten miles.

    Fiction book (1993)
  • The Brown Dense play is an old play made up of carbonate mudstone found at roughly 8,000-12,000 feet depths.

    Blog text (18)
  • La Puente is an expanse of naked mudstone, stripped of jungle and a layer of coal.

    Blog text (28)
  • Kadanuumuu's forearm was first extracted from a hunk of mudstone

    Academic text (2011)
  • The Nagar Village is a cluster of mudstone huts with the snow-capped Golden Peak mountain towering over it.

    Academic text (1997)
  • The edges of the depressions consist of tilted layers of sandstone, called cross beds, and their bowls are filled with mudstone.

    Academic text (2002)
  • The ancient cliffs are made up of various layers of mudstone, revealing the area's geological history.

Synonyms

shale
vsmudstone
  • Specialized
57 5.7

A rock made from clay that splits into thin flat layers

is made from compacted mud or clay and does not emphasize splitting
claystone
vsmudstone
  • Specialized
8.7

A hard rock made of tiny bits of clay pressed together

is the same rock expressed with a different name
argillaceous rock
vsmudstone
  • Specialized
9.8

A rock made mainly of clay that forms in layers

is the narrower term for rock from compacted mud or clay
argillite
vsmudstone
  • Specialized
9.9

A hard rock made from clay that does not split into thin sheets

is similar but focuses on compacted mud without stressing hardness

How Clayey

argillaceous rock
  • Specialized
9.8
claystone
  • Specialized
8.7
mudstone
  • Specialized
1 5.5
siltstone
  • Specialized
1 7.3

Surface Forms

mudstone singular
mudstones plural

Morphology

mudstone = mud + stone (transparent) = mud + stone

A straightforward compound whose meaning is directly derived from 'mud' + 'stone' referring to rock formed from compacted mud.

Etymology

The word mudstone is made from the simple words mud and stone, so it literally means 'mud turned into rock'. It names a fine rock formed when layers of mud are pressed and hardened into stone, which is why fossils are often kept inside it.