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Indentify three types of fossils

User VeenarM
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cast fossils, trace fossils, mold fossils
User AchrafBj
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mold fossils (a fossilized impression made in the substrate - a negative image of the organism)cast fossils (formed when a mold is filled in)trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.)
User Calebboyd
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