Earth Science Vocab Check - Geology

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Fossil

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Remains, imprints, or traces of prehistoric organisms.

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Permineralized remains

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Fossils with spaces filled by groundwater minerals.

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Carbon film

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A thin film of carbon residue preserved as a fossil.

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Mold

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Type of body fossil formed in rock when an organism with hard parts is buried.

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Cast: type of body fossil formed when crystals fill a mold or sediments wash into a mold.

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Cast fossil formation.

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Index fossil

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Remains of an organism that existed on Earth for a short time.

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Principle of superposition

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Oldest rocks at the bottom, younger rocks on top.

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Relative age

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Age of something compared to other things.

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Unconformity

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A gap in rock layers due to erosion or non-deposition.

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Absolute age

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Age in years of rock or other object.