It's Petrified At Times

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Across
  1. 3. British Term for Corn
  2. 4. Element Created a Rush in 1849
  3. 6. Pine, Redwood, and Fir for Example
  4. 7. Trump Building Project
  5. 8. Elevated Landform
  6. 12. Measure of Height
  7. 15. Super Fast Movement
  8. 16. Native Americans also Known as Sioux
  9. 17. Important in History
  10. 18. Beaver's Den
  11. 21. Fought in the Battle of Little Big Horn
Down
  1. 1. Rear End of a Pig
  2. 2. Not Living
  3. 3. Ice Age Mammal
  4. 5. Common Igneous Rock
  5. 7. Fish, Close Relative to Pikeperch
  6. 9. Darkest Color
  7. 10. Tragic Event
  8. 11. Longest River in N. America
  9. 13. Wild and/or Aggressive
  10. 14. American Buffalo
  11. 16. Former President
  12. 19. Deep Ravine Made by Fast Stream
  13. 20. Abundant Mineral, Crystal Structure