From the standpoint of its geological and structural nature, Pietra Piasentina is a sedimentary limestone of secondary origin resulting from the re-cementing of carbonate deposits.

Pietra Piasentina belongs to the carbonate megablocks that make up the powerful sequence of the flysch of Grivò (Early Palaeocene - Lower Eocene), originated by gravitational processes in marginal platform and slope areas, initiated by tectonic movements. In petrographic terms Pietra Piasentina is classified as calcarenite.