Volcanic sandstone – mudstone from Middle Eocene age
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 25% to 75% ash is described as tuffaceous sandstone.
Tuff composed of sandy volcanic material can be referred to as volcanic sandstone. volcanic sandstone is a relatively soft rock,
volcanic sandstone can be classified as either igneous or sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentological terms.
