1. Texas Through Geologic Time

2. Precambrian

3. Precambrian Enchanted Rock, Fredericksburg, TX

4. Cambrian

5. Cambrian

6. Ordovician

7. Ordovician

8. Ordovician Franklin Mountains, El Paso, TX

9. Silurian

10. Devonian

11. Devonian

12. Mississippian

13. Pennsylvanian

14. Pennsylvanian

15. Pennsylvanian Ouachita Mountains, Marathon Basin, TX

16. Permian

17. Permian

18. Permian El Capitan, Guadalupe Mountains National Park, TX

19. Triassic

20. Triassic

21. Triassic Palo Duro Canyon, Canyon, TX

22. Jurassic

23. Jurassic Louann Salt Dome, Gulf of Mexico, TX

24. Cretaceous

25. Cretaceous

26. Cretaceous Santa Elena Canyon, Big Bend National Park, TX

27. K-T Boundary

28. Tertiary

29. Tertiary

30. Tertiary Davis Mountains, Fort Davis, TX

31. Quaternary

32. Quaternary

33. Quaternary Laguna Madre, Padre Island National Seashore, TX