Geologic Time

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Across
  1. 5. fossil Imprint or mark left by a organism
  2. 7. A reptile which is extinct
  3. 8. fossil Used to determine the age
Down
  1. 1. The remains or impression of something
  2. 2. A mammal which is extinct
  3. 3. Turned into stone
  4. 4. An element that forms a chemical
  5. 6. A pale yellow, sometimes reddish or brownish fossil