In geology, what is the process by which organic material is turned to stone by naturally impregnating it with silica or iron and sulfur?
Petrified Silicification Silicified Petrify Petrifications Petrification Petrifaction Petrified fossils
petrifaction petrify petrified fossils silicified petrification petrified silicification petrifications
petrification
WikipediaEntity
Petrification