* They are all sedimentary rocks. This means they are formed from the accumulation and cementation of sediments, like sand, mud, and shells.
* They are formed through a process called lithification. This involves the compaction and cementation of sediments, turning them into solid rock.
* They are found in layers. These layers are called strata and are often used by geologists to understand the history of the Earth.
* They can contain fossils. The organic remains of plants and animals can be preserved within these rocks, providing clues about ancient life and environments.
While they share these commonalities, they also have distinct differences based on their origin and composition.
