LIST OF ILLUSTRATIONS. 
No. Page. 
1. Section, illustrating the order of succession of the strata in New-York. 27 
2. View of Medina falls. 34 
3. Diagonal and curved lamination of strata. 40 
4. Ditto . 41 
5. Fossils of Medina sandstone,..... 46 
6. Ditto 48 
7. Ripple marks... 49 
8. Surface of stratum of the Medina sandstone .. 50 
9. Shrinkage cracks of the Medina sandstone.... 51 
10. Stranded shells with ridges of sand. 52 
11. Wave lines . 54 
12 and 13. Modern illustrations of the two preceding cuts. 56 
14. Fucoids of the Clinton group.». 69 
15. Fossils of the Clinton group.... 70 
16. Ditto ... 71 
17. Ditto . 72 
18. Ditto . 76 
19. Ditto ... . 77 
20. Section illustrating the order of succession...... 78 
21. Dkto 79 
22. View of Niagara falls. 80 
23. Upper falls at Rochester. 82 
24. Concretionary and contorted strata. 86 
25. Porites, cavity formed by the removal of... 86 
26. Fragments of encrinital columns. 90 
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