Biology - Fossilisation
Certain conditions are required for fossilisation  to take place. These
* rapid burial under sediments, freezing in ice, embedding in hardened
* prevention of decomposition
* consolidation and compression
EXAMPLES AND CONDITIONS
Mammoths in ice, insects in amber, sloths mummified in caves (dry).
Anaerobic acid conditions, peat bogs;
Soft marine/terrestrial plants: imprints left as C layer or impression.
Bones, teeth, shells: often unaltered and intact; buried under
The skull of twenty-million-years-ago Ekaltadeta Ima, a carnivorous
kangaroo, found in the rich fossil trove in Riversleigh limestone, North
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