Give two examples in which fossils on the basis of the places where they were formed
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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.)
cast fossils (formed when a mold is filled in)
trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.)
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