EXPLANATION OF THE PLATES. 
PLATE VII. 
Fig. 1. Section of the Helderberg and water limestones, Rosendale, Ulster county. 
2. Section of the limestones pitching against the Shawangunk grit, Ulster county. 
3. The sajne as they appear to the eye. 
4. The same with faults, as though the limestone and grit were interstratified. 
5. Helderberg limestone and cement beds at White’s quarries. Faults and contortions. 
6. Section at Wilbur, showing similar appearances. 
7. Section at Wallkill falls, Dashville, Ulster county. 
8. Arched strata at Dashville. 
8^ Magnified illustration of 8, showing the cracks formed in bending. 
9. Section of the Helderberg limestone and Hudson river slates, unconformable, be¬ 
tween Glasco and the Great falls of Esopus creek, Ulster county. 
PLATE VIII. 
Fig. 1, 2, 3. Sections of the Helderberg limestone and Hudson river slate, unconformable, 
and the superposition of the quaternary and alluvial, Greene county. 
4. Section at High falls, Rondout, Ulster county. 
5. Cement beds, confused stratification, near Rondout. 
6. Fault at the falls of Esopus creek. 
7. Reversed limestones at High rock, one mile northwest of Kingston point, Ulster 
county. 
8. Faults of the limestone on the ridges between Hurley and Kingston. 
9. Showing the position of the same rocks as the preceding, on the south side of the 
anticlinal axis. 
10. Fault and anticlinal axis. Transverse section across the north end of the lake at 
Marbletown. 
PLATE IX. 
Contortions of the Hudson slate, to wit: 
Fig. 1 and 2. One mile and a half below Croft’s point, Columbia county. 
3. One mile and three quarters below Croft’s point. 
4. On the point opposite the head of the^island, two or three miles below Croft’s point. 
5. One mile and a quarter below Rhinebeck landing. 
6 and 7. Opposite the Light-house, Germantown, Columbia county. 
8. One mile and a quarter below Rhinebeck landing, Dutchess county. 
9. At the point below Rhinebeck landing. 
10 . ---. 
11. Right bank of Rondout-kill, Eddyville, Ulster county. 
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