Coralline Rock is a type of rock formed by the death of layers of Coralline algae.
Green algae | green algae | Coralline | brown algae | Shown above as a result of a 7 week period where the columns have been allowed to grow algae, cyanobacteria and other bacterial colonies. Of specific interest are the red regions of the middle column, indicative of purple non-sulfur bacteria (e.g. ''Rhodospirillaceae | International Code of Nomenclature for algae, fungi, and plants | Coralline algae |