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Module 1: Evolución

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XSIQ
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Biology - Fossilisation

Fossilisation

Certain conditions are required for fossilisation [1] to take place. These
are:

* rapid burial under sediments, freezing in ice, embedding in hardened
resin (amber)

* prevention of decomposition

* consolidation and compression

PART
FREQUENCY
EXAMPLES AND CONDITIONS

WHOLE ORGANISM
Rare
Mammoths in ice, insects in amber, sloths mummified in caves (dry).

SOFT PARTS
Rare
Anaerobic acid conditions, peat bogs;
Soft marine/terrestrial plants: imprints left as C layer or impression.

HARD PARTS
Numerous
Bones, teeth, shells: often unaltered and intact; buried under
sediments.

The skull of twenty-million-years-ago Ekaltadeta Ima, a carnivorous
kangaroo, found in the rich fossil trove in Riversleigh limestone, North
Queensland.

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Links:
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[1] http://alison.com/#