Mold (imprint) fossils
When a leaf, feather, bone or even a body of an organism leaves an imprint on sediment, which hardens and becomes rock
When minerals fill in the hollows of an animal track, a mollusk shell, or another part of an organism
Fuels formed by the remains of dead plants and animals
The body of an organism, with all the parts intact. Usually preserved in ice, amber, or tar.
When minerals replace wood or stone to create either petrified wood or a mineralized fossil
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