Geologic Time and Fossils Crossword

This printable crossword puzzle on the topic of Rocks & Minerals has 16 clues. Answers range from 4 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

A record of the earths history
The time in earth when only single cell organisms lived
Anceint Life: includes cambrian explosion
Mid Life: age of reptiles
Recent Life: age of mammals
The age of a rock compared to it's layers
The numeric age of an object or event
Preserved remains of an organism from the past
The process by which organic material is turned to stone
Spaces in rock occupied by bones or shells
When fossils fill with sediment and hardens its shape
A fossil of a foot print from an animal
The geologic principle that states that each layer is older than the one above
A break in geologic record created when rock layers eroded
Fossils of distributed organisms that only lived shortly
The gradual change in speices over time