Geologic Time scale

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Across
  1. 4. scientist who studies the history of life on Earth through the fossil record.
  2. 5. other layers
  3. 6. age; the age of a rock layer compared
  4. 7. very long period of time
  5. 8. expert in the field of geology
Down
  1. 1. they all existed as a single continent
  2. 2. age; The absolute age of a layer of rocks or fossils
  3. 3. remains or traces of prehistoric life.a Index fossil; fossil that is useful for dating and correlating the strata in which it is found.
  4. 4. a length or portion of time
  5. 7. a long and distinct period of history with a particular feature or characteristic.