Section 3.4 fossils Flashcards

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1
Q

The remains or physical evidence of an organism preserved by geological process.

A

Fossil

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2
Q

A fossilized mark that is formed in soft sediment by the movement of an animal.

A

Trace fossil

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3
Q

A mark or cavity made in a sedimentary surface by a shell or other body.

A

Mold

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4
Q

A type of fossil that forms when sediments fill in the cavity left by a decomposed organism.

A

Cast

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5
Q

A fossil that is found in the rock layers of only one geological age and that is used to establish the age of the rock layers.

A

Index fossil

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