Geologic Time and Fossils Crossword

A record of geologic events and life forms in Earth's history
Name for the period of time in Earth's history thats 90% of Earth's time; cellular organisms lived
Ancient Life includes cambrian explosions
middle Life age of reptiles
Recent life age of mammals
The age of a rock compared to rock layers
The numerical age of an object or event, as established by an absolute-dating process, such as radiometric dating
The preserved remains or traces of an organism that lived in the past
the process by which organic material is turned into stone
spaces in rocks previously occupied by bones or shells
when fossils fill with sediments/minerals and hardens to take it's shape
a fossil of a footprints, trails, burrow, or other traces of animals
The geologic principle that each layer is older then the one above
A break in geologic record created when rock layers eroded
Fossils of widely distributed organisms that only lived for a short period of time
the gradual change in a species over time