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05-Sep-2020 05:18

Footprints, tools, or plant matter are different types of trace fossils.

The two fossil categories can be broken down further.

Animals that die in bogs and sink beneath the surface are protected from the elements, other animals, and bacteria that cause decay.

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Some organic material, like tree trunks, can be petrified.More sediment settles on the remains, and time and pressure turn the sediment surrounding the bones and teeth to stone.Groundwater seeps into the newly made stone and dissolves the bone, leaving behind a mold.The mold is an empty cavity, and can be filled with minerals that become a cast for the long dissolved bone.

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There are some rare places where a whole animal can be preserved.A bog is a type of wetland where a large amount of dead plant matter accumulates.