Geologic History Crossword
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
 
 
Down: 1) A fossil we know came from a specific geologic time period and so can be used to date the rock units that contain it 3) Geologic age expressed in number of years from the present. Across: 2) Age expressed as older than, younger than, or same age as, instead of in number of years 4) A principle that describes the specific order of fossils, from lower to higher, within geological strata 5) A timeline of Earth’s history 6) Principle that states that younger rocks lie above older rocks. “Younger over older.”
 

 

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