Calcarenite is a type of rock formed by the sedimentation of layers of limestone and is very common in Sicily.
The Agrigento calcarenite is very porous, soft and crumbly, but useful for to its resistance to weather (rain and wind).
The ease with which it was cut, worked and sculpted made it very popular for the construction of entire buildings or decorative elements.
The territory of Agrigento is particularly rich in this material used to build the temples.
Calcarenite contains shell fossils, varying in colour from reddish yellow to light yellow, and gives the structures the characteristic appearance we see today