XXII 
LIST OF ILLUSTRATIONS. 
LITHOGRAPHIC PLATES AT THE END OF THE WORK!. 
1. Organic remains of the Medina sandstone. 
2. Surface of Medina sandstone, with current marks. 
3. Fin and scales of Sauripteris Taylori. Old red sandstone. 
4. Natural section of Niagara river. (Colored.) 
6, 6, 6, a and 6 b. Coast section of lake from Black-Rock to the Pennsylvania line. 
7. Section across the formations between Lake Ontario and the northeastern extremity of the 
Pennsylvania coal field. (Colored.) 
8. Uplifted strata and intermingled drift. (Colored.) 
9, 10, 11 and 12. Section across the several counties of the Fourth district. (Colored.) 
13. Natural section of the Genesee river from Mount-Morris to Portage, New-York; and one 
from Cleveland, Ohio, to the Mississippi river. (Colored.) 
14. Grooved and striated surface of limestone, with projecting knobs of hornstone. 
15. View from Big-flats, Chemung county. 
16. Ravine at Hammondsport, Steuben county. 
17. Hector falls, Tompkins county. 
18. Lodi falls, Seneca county. 
19. Deep gorge of the Genesee at Portage. 
