Unit 4 Flashcards
0
Q
What is a cast?
A
A filled in a cavity left by the original body
1
Q
What is a trace fossil?
A
Cavity of track left behind by an organism(not filled in)
2
Q
What are index fossils?
A
Fossils used to identify a certain time period or era
3
Q
What is a geological column?
A
Rock formations deposited p-oldest(bottom) to youngest(top)
4
Q
What are the 4 eras?
A
Precambrian,Paleozoic,Mesozoic,Cenozoic
