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Slide 1

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FOSSILIZATION PROCESSES
How may the hard parts of
organisms be preserved
as fossils?…read more

Slide 2

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FOSSILIZATION PROCESSES
How may the hard parts of
organisms be preserved
as fossils?
PETRIFICATION
`turning to stone'
By mineral replacement…read more

Slide 3

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FOSSILIZATION PROCESSES
1 CALCIFICATION
Replacement of aragonite
by calcite (destroys
internal structure)
Impregnation of
calcareous shells by
calcite…read more

Slide 4

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FOSSILIZATION PROCESSES
2 SILICIFICATION
Silica replaces calcite,
chitin, wood
Amorphous silica (opal)
may preserve micro-
structure…read more

Slide 5

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FOSSILIZATION PROCESSES
3 PYRITISATION
Pyrite replaces calcareous
shells, graptolites
Tends to oxidize &
disintegrate once exposed
to air (`pyrite rot')…read more

Slide 6

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FOSSILIZATION PROCESSES
How may the hard parts of
organisms be preserved
as fossils if the original
shell is removed eg in
solution?
MOULDS
1 Decay of soft parts
leaves a hollow
INTERNAL MOULD…read more

Slide 7

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