PLATES |
| PLATE | | FOLLOWING PAGE |
| 1. | Physiographic diagram: Atlantic Ocean, Sheet 1 | (In separate tube) |
| 2. | Preliminary chart of Hudson Submarine Canyon | 20 |
| 3. | Representative PDR records from continental rise of northeastern United States | 32 |
| 4. | PDR records from continental slope and Blake Plateau | 32 |
| 5. | PDR records from outer ridge east of the Blake Plateau and from the Blake-Bahama Abyssal Plain | 32 |
| 6. | PDR record of outer ridge showing sub-bottom horizon | 32 |
| 7. | Tracings of PDR records across continental slope and part of the Blake Plateau | 36 |
| 8. | PDR records European continental rise and Biscay Abyssal Plain | 38 |
| 9. | Representative PDR records of continental margin and abyssal floor southwest of Canary Islands | 38 |
| 10. | PDR record of abyssal hills, southeast of Bermuda Rise | 38 |
| 11. | Ocean bottom photographs of the continental margin and ocean basin floor | 38 |
| 12. | PDR record of Biscay Abyssal Plain | 52 |
| 13. | PDR records of Madeira Abyssal Plain and the Madeira Rise | 52 |
| 14. | PDR records of Mid-Ocean Canyon No. 2 and canyons at Vema Gap | 58 |
| 15. | Ocean-bottom photographs of seamounts | 58 |
| 16. | Representative PDR records from Bermuda Rise | 78 |
| 17. | PDR record, Bermuda Scarp Zone | 78 |
| 18. | PDR record, Upper Step Mid-Atlantic Ridge | 78 |
| 19. | Ocean-bottom photographs; Mid-Atlantic Ridge | 78 |
| 20. | Physiographic provinces, Atlantic Ocean | 122 |
| 21. | Control chart | 122 |
| 22. | Six trans-Atlantic topographic profiles | 122 |
| 23. | Index chart showing locations of profiles of Plates 24, 25, 26 and Figure 45 | 122 |
| 24. | Thirty-four profiles of the continental margin: western North Atlantic | 122 |
| 25. | Twenty-three profiles of the continental margin of Europe and Africa | 122 |
| 26. | Crustal structure and continental-margin provinces | 122 |
| 27. | Five topographic profiles, western North Atlantic | 122 |
| 28. | Distribution of deep-sea sands in relation to physiographic provinces | 122 |
| 29. | Earthquake epicenters, North Atlantic | 122 |
| 30. | Location of PDR records and bottom photographs reproduced as illustrations. | 122 |
FIGURES |
| FIGURE | | PAGE |
| 1. | Method of preparation of physiographic diagram | 4 |
| 2. | Precision depth recorder (PDR) sounding lines obtained by research vessels | 6 |
| 3. | Good, but nonprecision sounding lines obtained by research vessels | 7 |
| 4. | Major basins of the North Atlantic, after WÜst (1940) | 12 |
| 5. | Sound-velocity corrections for echo soundings | 13 |
| 6. | Conversion diagram for degrees, per cent grade, feet per statute mile, and gradient | 14 |
| 7. | Gradients from 1:5 to 1:8000 shown at 40:1 vertical exaggeration | |
