Eisco Argillaceous Shale Specimen (Sedimentary Rock), Approx. 1″ (3cm)

Shale is formed from the cementation and lithification of very small grains of rock, commonly mud or clay. The small clast size indicates that though the grains had been heavily eroded, the rock formed in a low energy environment. Shale is useful in sedimentary rock identification exercises due to its recognizable fissile habit. This sample is also available in packs of 12.