Geologic Time Scales

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Across
  1. 2. the exact age of a rock strata
  2. 4. States that if a fault or igneous intrusion occurs, that layer is the youngest
  3. 5. amount of time it takes for half an isotope to decay
  4. 6. another name for a layer of rock
  5. 8. A fossil used to categorize age of rock strata
Down
  1. 1. States that if fragments of older rock is found in newer rock, that rock is older
  2. 3. the end of a species
  3. 4. States that younger layers are on top and older layers are on the bottom
  4. 7. way of comparing rock strata age