Pelagosite

Referred Pelagosit (after the island Palagruža, Italian Pelagosa, Adria) a first in 1876 discovered by Carlo de Marchesetti and 1878, in Tschermak Mineralogical and petrographic releases and 1882/83 described by Marchesetti calcareous sinter formation, a hard in the splash zone of subtropical and tropical seashores shiny and black colored coating over the rocks formed. The coating goes back to the encrusting activity of cyanobacteria, and consists mainly of aragonite pisolithischem with a low content of impurities, usually organic in nature.

The mode of formation has long been controversial. Major contribution to the study of Pelagosit had the work of Ettore Onorato from the year 1926. Recent work comes from Montanari and others ( 2007), who see in the detailed study of such crusts the possibility of past climate and the elevation or to reconstruct reduction history of Mediterranean islands.