1. THE PERMIAN Reptiles Dimetrodon Mammal-like Reptiles

2. THE PERMIAN Eggs Amniotic egg allowed Organisms to become terrestrial

3. THE PERMIAN Plants Glossopteris

4. THE PERMIAN Permian Extinction

5. THE TRIASSIC The Break-up of Pangaea Three-fold division of rocks in Germany Named by Frederich von Alberti in 1834

6. THE TRIASSIC

7. Absaroka Sea continues to retreat Triassic is very terrestrial Period

8. THE TRIASSIC

12. Joshua Chamberlain, left Little Round Top, Battle of Gettysburg 3 July, 1863

13. THE TRIASSIC Chinle Formation, Petrified Forest National Park

14. THE TRIASSIC Chinle Formation, Painted Desert

15. THE TRIASSIC Triassic Reptiles Mammal-like

16. THE TRIASSIC Triassic Reptiles Diversification of dinosaurs Coelophysis Dilophosaurus

17. THE TRIASSIC First Marine Reptiles

18. THE TRIASSIC Mammals Evolve

19. THE JURASSIC Named for strata in Jura Mountains between France and Switzerland Named by Alexander von Humbolt in 1795 Redefined by Leopold von Buch in 1839

20. THE JURASSIC

21. Nevadan Orogeny

22. THE JURASSIC Nevadan Orogeny

23. THE JURASSIC Nevadan Orogeny Emplacement of batholiths

24. THE JURASSIC Cordilleran Orogeny

25. THE JURASSIC Cordilleran Orogeny

26. THE JURASSIC Cordilleran Orogeny

27. THE JURASSIC Cordilleran Orogeny

28. THE JURASSIC Absaroka Sea continues to retreat Jurassic is very terrestrial Period Transgression of Zuni Sea at end of Jurassic

29. THE JURASSIC DinosaursOrnithischian (Bird-hipped)

30. THE JURASSIC DinosaursOrnithischian (Bird-hipped)

31. THE JURASSIC DinosaursSaurichian (Lizard-hipped) Therapods Tyrannosaurus Velociraptor

32. THE JURASSIC DinosaursSaurichian (Lizard-hipped) Sauropods Apatosaurus Diplodicus

33. THE JURASSIC Birds Actually arose from LIZARD-hipped Dinosaurs Archeopteryx

34. THE JURASSIC Angiosperms Arose in Late Jurassic

35. THE JURASSIC Arches National Park

36. THE JURASSIC Canyonlands National Park

37. THE JURASSIC Colorado National Monument

38. THE JURASSIC Colorado National Monument Morrison Formation

39. THE JURASSIC More Morrison Formation I-70 Roadcut Morrison, CO

40. THE CRETACEOUS The Age of Dinosaurs II Named for the latin word for chalk Named by Omalius d’Halloy in 1822

41. THE CRETACEOUS

42. Orogenic Events – Cordilleran continues

43. THE CRETACEOUS Orogenic Events - Sevier Orogeny

44. THE CRETACEOUS Orogenic Events - Sevier Orogeny

45. THE CRETACEOUS Orogenic Events

46. THE CRETACEOUS Orogenic Events – Laramide Orogeny

47. THE CRETACEOUS Orogenic Events – Laramide Orogeny

48. THE CRETACEOUS Cretaceous is very marine Period Transgression of Zuni Sea continues into the K

49. THE CRETACEOUS Craton flooded for the last time

50. THE CRETACEOUS Craton flooded for the last time Pierre Shale

51. THE CRETACEOUS Craton flooded for the last time

52. THE CRETACEOUS Ammonites Complex coiling and suture patterns

53. THE CRETACEOUS Craton flooded for the last time

54. THE CRETACEOUS Bryce Canyon National Park

55. THE CRETACEOUS Mesa Verde National Park

56. THE CRETACEOUS The Cretaceous-Tertiary Extinction

57. THE CRETACEOUS The K-T Extinction