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Fossils And Geologic Time Crossword Puzzle

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Fossils and Geologic Time

  6                                           7    
      8             9                              
          12                                 13      
        16                             17            
                    18                         19    
            21             22                        
Across Down
9 scientist who studies fossils
10 age of something compared to something else
11 Longest time period in Earth's Geologic History
12 surface where new rock layers meet a much older rock surface beneath them
13 a hollow area in sediment in the shape of an organism
14 Geologist use this law to determine the relative ages of rocks
16 an extremely thin coating of carbon on rock
18 type of rock where fossils are most likely found
23 the number of years since a rock has formed
1 remains of organisms in tar, amber or ice
2 when an organism no longer exists and will never again exist
3 animal with strong legs and eggs with thick shells
4 animal that evolved from lungfish
5 evidence of the activities of ancient organisms
6 name of fossil used to help geologists match rock layers
7 hardened layer of rock below Earth's surface
8 animal that feeds its young milk
9 fossils in which minerals replace all or part of an organism
15 a hardened layer of lava on Earth's surface
16 a copy of the shape of an organism
17 animal with a backbone
19 'Age of the Mammal'
20 preserved remains or traces of living things
21 'Age of the Fish'
22 'Age of the Reptile'
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