1. Earth: Geologic Principles and History FIRST EDITIONCHERNICOFF/FOX/TANNER

2. Chapter 22 Paleozoic Life

3. Copyright © by Houghton Mifflin Company. All rights reserved.3 Figure 22.02: Small shelly fauna

4. Copyright © by Houghton Mifflin Company. All rights reserved.4 Figure 22.04: Interpreting Hallucigenia

5. Copyright © by Houghton Mifflin Company. All rights reserved.5 Figure 22.05: Pikaia

6. Copyright © by Houghton Mifflin Company. All rights reserved.6 Figure 22.06: Trilobite shell morphology

7. Copyright © by Houghton Mifflin Company. All rights reserved.7 Figure 22.09: Brachiopod morphology

8. Copyright © by Houghton Mifflin Company. All rights reserved.8 Figure 22.10a: Brachiopod life positions

9. Copyright © by Houghton Mifflin Company. All rights reserved.9 Figure 22.10b: Brachiopod life positions

10. Copyright © by Houghton Mifflin Company. All rights reserved.10 Figure 22.11: Bivalve morphology

11. Copyright © by Houghton Mifflin Company. All rights reserved.11 Figure 22.12: Gastropod shapes

12. Copyright © by Houghton Mifflin Company. All rights reserved.12 Figure 22.13: Cephalopod shell morphology

13. Copyright © by Houghton Mifflin Company. All rights reserved.13 Figure 22.14: Stalked echinoderm morphology

14. Copyright © by Houghton Mifflin Company. All rights reserved.14 Figure 22.17: Graptolites

15. Copyright © by Houghton Mifflin Company. All rights reserved.15 Figure 22.18: Archaecyathids

16. Copyright © by Houghton Mifflin Company. All rights reserved.16 Figure 22.21: Bryozoans

17. Copyright © by Houghton Mifflin Company. All rights reserved.17 Figure 22.23: Geologic ranges of modern and extinct classes of fish

18. Copyright © by Houghton Mifflin Company. All rights reserved.18 Figure 22.24: Jawless fish

19. Copyright © by Houghton Mifflin Company. All rights reserved.19 Figure 22.25: Evolution of jaws

20. Copyright © by Houghton Mifflin Company. All rights reserved.20 Figure 22.26: Placoderms

21. Copyright © by Houghton Mifflin Company. All rights reserved.21 Figure 22.27: Acanthodian fish

22. Copyright © by Houghton Mifflin Company. All rights reserved.22 Figure 22.28: Bone structure in fins of ray-finned and lobe-finned fish

23. Copyright © by Houghton Mifflin Company. All rights reserved.23 Figure 22.29: Rhipidistian fish

24. Copyright © by Houghton Mifflin Company. All rights reserved.24 Figure 22.35: Early amphibian

25. Copyright © by Houghton Mifflin Company. All rights reserved.25 Figure 22.36: Labyrinthodont amphibian

26. Copyright © by Houghton Mifflin Company. All rights reserved.26 Figure 22.37b: Pelycosaurs

27. Copyright © by Houghton Mifflin Company. All rights reserved.27 Figure 22.38: Late Permian therapsids

28. Copyright © by Houghton Mifflin Company. All rights reserved.28 Figure 22.39: Skull structure in reptiles

29. Copyright © by Houghton Mifflin Company. All rights reserved.29 Figure 22.40: Major mass-extinction events