LIST OF ILLUSTRATIONS 



FIG. PAGE 



'Cryptozoon Boreale .... Froiilispiece 

 ^ Map xvi 



1. Olenellus 20 



2. Triarthrus 23 



3. Hymenocaris 27 



4. Ctenichnites ........ 32 



5, 6. Arch^ocyathus 35 



7, 8. Cryptozoon 37, 39 



9. Fossils in Lower Cambrian Boulder . .41 



10. Section Hanford Brook 51 



11. Worm Tracks 53 



12. Pre-Cambrian Fossils 54 



13. Arenicolites and Aspidella .... 54 



14. Cryptozoon . ....... 56 



15. Worm Burrows 67 



16. Casts of Foraminifera 68 



17. Tudor Eozoon 69 



18. Laurentian America 85 



19. Map of Grenville Limestones . . . .88 

 19A. Attitude of Limestone, Cote St. Pierre . 91 



20,21. Disturbed Beds 103 



22. Section of Limestone 113 



23. Silicification of Coral 113 



24. Cast of Polystomella in Glauconite . .115 



xiii 



