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mudstone
This term describes a specific geological formation characterized by its dense, fine-grained texture. It is typically used in technical, scientific, or academic contexts by geologists and paleontologists to categorize sedimentary strata. The word carries a neutral, descriptive connotation, focusing on the material composition and the process of lithification.
As a mass noun referring to a type of rock material, it is generally treated as uncountable when discussing the substance itself. However, it can be used as a countable noun when referring to specific layers, types, or samples of the rock, such as when a geologist identifies various mudstones across different regions.
Meanings
Examples
The cliff face consists of alternating layers of sandstone and mudstone.
Look at this sample. The mudstone is much denser than the shale.
The fossil was perfectly preserved within a slab of grey mudstone.
I wonder if this mudstone layer indicates an ancient lake bed.
Mudstone often acts as a seal for oil and gas reservoirs.
The geologist noted that the mudstone was highly fissile.
We found a vein of quartz cutting through the dark mudstone.