List Of Illustrations

1. Map of Argentina 28

2. Glyptodonts and giant sloths 30

3. Geologic and evolutionary time scale 32

4. Genealogical relationships of vertebrates 57

5. Sprawling and erect postures 61

6. Genealogical relationships of dinosaurs 62

7. Genealogical relationships of theropods 66

8. Patagonian theropod Giganotosaurus 68

9. Genealogical relationships of sauropods 71

10. Patagonian sauropod Amargasaurus 72

11. Skeleton of the titanosaur Saltasaurus 74

12. Patagonian titanosaur Argentinosaurus 76

13. Dinosaur egg sites 80

14. Main functions of an egg 81

15. Eggshell microstructure 82

16. Dinosaur eggs 84

17. Adult and embryonic titanosaur skulls 90

18. Sauropod skulls 90

19. Sauropod teeth 92

20. Embryonic and adult sauropod skin 96

21. Hatchling sauropods 98

22. Titanosaur Saltasaurus 100

23. An 80-million-year-old sauropod embryo 102

24. Land masses 80 million years ago 108

25. Radiometric dating 111

26. Magnetic polarity of Auca Mahuevo 113

27. Floodplain environment 120

28. Stratigraphic section of Auca Mahuevo 152

29. Dinosaur footprints from the Paluxi River 162

30. Nesting oviraptorids 164

31. Quarry map of Auca Mahuevo's egg layer 3 168

32. Adult sauropods patrol nesting colony 170

33. Map of Auca Mahuevo's egg-clutches 172

34. A nesting sauropod colony 174

35. Patagonian theropod Carnotaurus 178

36. Skulls of Aucasaurus and Carnotaurus 180

37. Patagonian theropod Aucasaurus 181

38. Titanosaur bony scutes 192

39. Aucasaurus attacking a sauropod 198

Photographs following page 160

1. Preparing the mold of a sauropod nest in the field

2. Mapping Auca Mahuevo's ancient topography

3. Lifting a plaster jacket of the meat-eater Aucasaurus

4. Mapping egg-clutches in the field

5. Luis Chiappe, Lowell Dingus, and Rodolfo Coria

6. Excavating bones of an adult titanosaur

7. Preparing an egg-clutch at the museum 8-9. The scaly aspect of the embryonic skin

10. The round sauropod eggs of Auca Mahuevo

LIST OF ILLUSTRATIONS • 13

11. Skull and limb bones of a sauropod embryo

12. A complete skull of an unhatched sauropod

13. Undercutting the plaster jackets of the fearsome Aucasa

14. Mapping eggs in the field

15. An egg-clutch weathers out

16. Saucerlike footprints of Auca Mahuevo sauropods

17. Collecting bones of an adult titanosaur

18. The picturesque badlands of Auca Mahuevo

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