science 3.4 Flashcards
1
Q
fossil
A
the remains or physical evidence of organism preserved by geological processes
2
Q
trace fossil
A
a fossilized mark that is formed in soft sediment by the movement of an animal
3
Q
cast
A
a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
4
Q
mold
A
a mark or cavity made in a sedimentary surface by a shell or other body
5
Q
index fossil
A
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
