Fossil formation
However, for an animal or a plant to
be preserved in the form of a fossil,
conditions need to be exactly right.
The organism must be quickly covered
in sediment that prevents erosion,
scavenging by animals or rapid
decomposition by bacteria. If all of
these criteria are met, then over time
the hard parts such as bones, shells
and teeth may become replaced by
minerals, leaving a durable, stony cast
or impression in the form of a fossil.
Fossil formation However, for an animal or a plant to be preserved in the form of a fossil, conditions need to be exactly right. The organism must be quickly covered in sediment that prevents erosion, scavenging by animals or rapid decomposition by bacteria. If all of these criteria are met, then over time the hard parts such as bones, shells and teeth may become replaced by minerals, leaving a durable, stony cast or impression in the form of a fossil.
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