1. What are the two eons on the Geologic Time Scale?
2. Which eon covers the longest amount of time?
3. How many millions of years ago did the Paleozoic Era begin?
4. How many millions of years ago did the Devonian Period end?
5. How many millions of years ago did the Jurassic Period end?
 
During what period did the following first appear on Earth?

6. Earliest fish
7. Eurypterids
8. Sharks
9. Dinosaurs

10. During what period did the Acadian Orogeny occur?
11. During what period was the Palisades Sill intruded?
12. For what periods is the rock record completely preserved in New York State?

For each of the following pairs, which form of life evolved first?

13. Running mammals  -  Earliest reptiles
14. Earliest fish – Stromatolites
15. Man  -  Earliest birds
16. Eurypterids  -  Large carnivores

17. During which Epoch did the advance and retreat of the last continental ice occur?
 
 

ANSWERS
1. Precambrian & Phanerozoic  2. Precambrian  3) 544  4) 362  5) 142  6. Cambrian
7. Silurian 8. Devonian 9. Triassic 10. Devonian 11. Triassic  12. Cambrian, Ordovician, Silurian & Devonian  13. Earliest reptiles 14. Stromatolites 15. Earliest dinosaurs 16. Eurypterids  17. Pleistocene