Types of preservation

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Replacement
Occurs when original material dissolved atom by atom, substituted with another mineral.
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Silicification
Occurs when percolating groundwater rich in silica dioxide (SiO2) moves through rock.
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Pyritisation
Replacement of original material by iron pyrites.
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Carbonisation
Process occurs during burial as overlying mass of rocks increases pressure and temperature.
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Mould
Form when fossils dissolve out rock they are in.
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Cast
Form when another mineral infills void (such as iron pyrites or silica).
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Other cards in this set

Card 2

Front

Occurs when percolating groundwater rich in silica dioxide (SiO2) moves through rock.

Back

Silicification

Card 3

Front

Replacement of original material by iron pyrites.

Back

Preview of the back of card 3

Card 4

Front

Process occurs during burial as overlying mass of rocks increases pressure and temperature.

Back

Preview of the back of card 4

Card 5

Front

Form when fossils dissolve out rock they are in.

Back

Preview of the back of card 5
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