Engage Learning Magazine | Geologic Timeline & Types of Fossils

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Fossil Types Depending on how a fossil forms,
paleontologists sort and classify them.
In a petrified fossil an organisms tissue is
replaced by minerals.
An organism trapped in amber, peat or tar is a
preserved fossil.
An organism that leaves an outline

A footprint is a trace fossil.
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Geologic Time
The diagram shows the periods of time that make
up Earths past. The further down you dig, the
older the time period.
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