Lithification (from the Ancient Greek word lithos meaning 'rock' and the Latin-derived suffix -ific) is the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock. Essentially, lithification is a process of porosity destruction through compaction and cementation. Lithification includes all the processes which convert unconsolidated sediments into sedimentary rocks. Petrifaction, though often used as a synonym, is more specifically used to describe the replacement of organic material by silica in the formation of fossils.
La litificazione è la trasformazione di un sedimento in una roccia sedimentaria (dura). Il termine indica l'insieme di tutti quei fenomeni che interessano il sedimento, a partire dalla sua deposizione e che conducono, per l'appunto, alla litificazione.
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