Geologic Time Vocabulary

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Across
  1. 6. a record of the geologic events and life forms in Earth's history
  2. 9. a scientist who studies fossils to learn about organisms that lived long ago.
  3. 11. age of dinosaurs
  4. 13. the age of a rock compared to the ages of rock layers.
  5. 14. a period of history with a particular characteristic or feature.
Down
  1. 1. the process of grouping things based on their similarities.
  2. 2. The oldest and longest span of geologic time.
  3. 3. the top layer of rock and its fossils are the youngest and the bottom layer the oldest.
  4. 4. the age of a rock given as the number of years the rock formed.
  5. 5. age of mammals
  6. 7. the largest division of geologic time
  7. 8. the study of rock layers.
  8. 9. an era characterized by fish, insects, and reptiles.
  9. 10. a scientist who studies the earth.
  10. 12. a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it was found.