Types of preservation 0.0 / 5 ? GeologyFormation of FossilsA2/A-levelOCR Created by: James DisneyCreated on: 04-05-17 14:44 Replacement Occurs when original material dissolved atom by atom, substituted with another mineral. 1 of 6 Silicification Occurs when percolating groundwater rich in silica dioxide (SiO2) moves through rock. 2 of 6 Pyritisation Replacement of original material by iron pyrites. 3 of 6 Carbonisation Process occurs during burial as overlying mass of rocks increases pressure and temperature. 4 of 6 Mould Form when fossils dissolve out rock they are in. 5 of 6 Cast Form when another mineral infills void (such as iron pyrites or silica). 6 of 6
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