Converse of object

• comprise: The Waterloo Mudstone Formation spans the Triassic Jurassic boundary, and comprises dark gray mudstones and shales, alternating with gray limestones.

• overlie: This arrangement of dolomitised limestone and overlying mudstone is the most common feature seen through both the prehistoric and more recent workings.

• deposit: In Russia and South Africa, gently deposited mudstones and limestones suddenly give way to massive dumps of pebbles and boulders.

Converse of subject

• dominate: The geology of much of the western half of Leicestershire is dominated by the red mudstones of the Triassic aged Mercia Mudstone Group.

Adjective modifier

• Triassic: On the north side of the Lagan Valley the Triassic sandstone is succeeded by reddish Triassic mudstone which does not provide a water supply.

• calcareous: The calcareous mudstones and limestones are rich in fossils.

• gray: In this area and at Lechlade, the Upper Thames Valley is floored by the gray mudstones of the overlying Upper Jurassic Oxford clay.

• marine: These marine mudstones are fossiliferous representatives of the Lower Jurassic or Lias.

• dark: At Helwith in Ribblesdale, the hard, dark grey-green mudstone quarried there is much in demand today for producing skid resistant roadstone.

• red: The geology of much of the western half of Leicestershire is dominated by the red mudstones of the Triassic aged Mercia Mudstone Group.

Modifies a noun

• horizon: Mudstone A degree of rehydration is noted in certain of the mudstone horizons, particularly where they are intersected by mineral veins.

• fragment: The rounded opaque grains were present in the parent clay ( some were observed in the mudstone fragments ).

• formation: The 3 mudstone formations There are three different mudstone formations found in the study area.

Noun used with modifier

• gray: These dark gray mudstones, gray to black shales and minor limestones contain ammonite and rare reptile fossils.

Preposition: of

• age: Geological Highlights: In Herefordshire, in the early 1990's a unique fossil deposit was found within nodules in mudstones of Silurian age.

Preposition: with

• siltstone: This formation typically consists of heavily faulted silty mudstones with thin quartzose siltstone and sandstone beds.