Earth History Crossword

This printable crossword puzzle on the topic of Rocks & Minerals has 10 clues. Answers range from 3 to 17 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

The branch of science involving physical composition and history of the planet
The system of time measurement involving the formation of and changes to Earth.
Very large division of geologic time usually referred to as the longest division of time
A common fossil found in many areas from a specific time used to help identify the age of other formations
Subdivision off an era
Subdivision off an eon
Fossil that forms when organic material is pressed between layers of rock
Subdivision of a period shortest division of a geologic time
Fossil that forms when a mold is filled with sediment and hardens into the shape of the organism
Occurs when a species dies out and no longer lives on the planet