6 Restless Ch 3.4 Review

The trace or remains of an organism that lived long ago.

• fossil
• trace fossil
• index fossil
• fossils in rock

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

• trace fossil
• fossil
• index fossil
• fossils in rock

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

• mold
• cast
• index fossil
• fossils in rock

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

• cast
• mold
• index fossil
• fossils in rock

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

• index fossil
• fossil
• trace fossil
• cast

When the bones or other hard parts of dead animals are covered by sediment and preserved.

• fossils in rock
• fossil
• petrifaction
• cast

When insects or small animals are covered by sap that hardens.

• fossils in amber
• petrifaction
• fossils in asphalt
• frozen fossils

When minerals replace the tissue of an organisim, such as this log.

• petrifaction
• fossils in amber
• fossils in asphalt
• frozen fossils

The La Brea pits are an example.

• fossils in asphalt
• fossils in rock
• fossils in amber
• frozen fossils

Wooly mammoths are a common example.

• frozen fossils
• fossils in amber
• petrifaction
• fossils in asphalt