Man o' War Bay on the Dorset coast (Jurassic Coast). The strata here are nearly vertical, as a result of ancient orogeny.

This aerial photo shows the sloping strata in the cliff quite well

Strata are layers of rock, or sometimes soil. In nature, strata come in many layers. It is a term in sedimentary and historical geology; the singular is stratum. The study of strata is called stratigraphy.

These layers are laid down as sediment, often in the sea, and are slowly changed by pressure, heat and chemical action into rocks.