Geologic Time Scale

12345678910
Across
  1. 4. gives age in actual years
  2. 5. newer rock layers are on the top of older ones unless the sequence is disturbed
  3. 9. remains of animals that represent a period of time
  4. 10. Rocks found inside of other rocks are the older of the two
Down
  1. 1. the comparison between two fossils/rocks
  2. 2. current and most recent of the 3 phanerozoic eras
  3. 3. Features like faults and dikes are newer than the rock they cut through
  4. 6. a useful fossil used for the dating and corelating the strata in which it is found
  5. 7. the amount of time it takes half of a remaining isotope to decay to a daughter product
  6. 8. first living organism said to be discovered