3.4 Looking at Fossils

Question 1

The remains or physical evidence of an organism preserved by geological processes

Answer 1

Fossil

Question 2

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

Answer 2

Trace fossil

Question 3

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

Answer 3

Mold

Question 4

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

Answer 4

Cast

Question 5

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

Answer 5

Index Fossil

Question 6

the process by which organic matter exposed to minerals over a long period is turned into a stony substance

Answer 6

Petrifaction

Question 7

the action or process of replacing someone or something

Answer 7

Replacement

Question 8

a piece of fossilized dung

Answer 8

Coprolite

Question 9

Because of its narrow time range, Tropites is a good index fossil useful for stratigraphic correlations. Tropites is characterized by a distinctive, easily recognizable, globular shell within a central keel.

Answer 9

Tropites

Question 10

A genus of trilobites found in the Silurian and Devonian formations. Phacops bufo is one of the most common species.

Answer 10

Phacops