Section 3.4 fossils Flashcards
1
Q
The remains or physical evidence of an organism preserved by geological process.
A
Fossil
2
Q
A fossilized mark that is formed in soft sediment by the movement of an animal.
A
Trace fossil
3
Q
A mark or cavity made in a sedimentary surface by a shell or other body.
A
Mold
4
Q
A type of fossil that forms when sediments fill in the cavity left by a decomposed organism.
A
Cast
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
