a: index fossil ~
b: bookmark
What:
"Explain that an index fossil is like a bookmark of sorts. It is used by scientists to help date specific rock layers. Only fossils that are abundant, existed as a species for a relatively short time, and are dispersed around the world are designated as index fossils."
Useful?
Writer: Not Stated
LCC:
Where:
Date: Jan 13 2019 11:26 AM
# 12050 Critique Analogy