Claystone: meaning, definitions and examples

Refer to fine-grained sedimentary rock composed primarily of clay-sized particles, often found in ancient lake beds or as geological layers.

• The geologist collected claystone samples from the excavation site
• The presence of claystone indicates a historical water body

Typically used to describe a slightly metamorphosed claystone, often harder and more compact, generally found in older geological formations.

• The argillite exhibited distinctive layering due to its metamorphic history
• Ancient tools made from argillite were found at the archaeological site

Usually describes a fine-grained sedimentary rock composed of clay and silt-sized particles, it lacks the fissility (tendency to split into thin layers) seen in shale.

• The mudstone revealed a rich sequence of sedimentation
• Fossils found embedded in the mudstone offer clues to prehistoric life

Commonly used for laminated and fissile fine-grained sedimentary rock composed of clay minerals and silt-sized particles, often associated with oil and gas deposits.

• The shale formation holds significant petroleum reserves
• Shale gas extraction has increased dramatically in recent years due to advances in drilling technology