EXPLANATION OF THE PLATES. 
PLATE XII. 
Fig. 1. Section from the Noses on the Mohawk, to Summit four-corners in Schoharie county. 
2. 3, 4. Contorted slate, 
5. Arched and disrupted. 
6 and 7. Slaty cleavage and strata. 
8. Section across Lebanon valley. 
PLATE XIII. 
Fig. 1. Section from Troy to the Massachusetts line. 
2 . --. 
3. Section across the valley of Stone creek, Columbia county. 
4. Section across New-Lebanon valley, through Middle Shaker Medical Garden. B. 
5. Across the same valley, south of the South Shaker Family. B. 
6. Section from Canaan four-corners to Austerlitz. C. 
PLATE XIV. 
Fig. 1. Section from Hillsdale to Egremont, Columbia county. 
2. From Canaan to Whiting’s pond. 
3. From Austerlitz to Spencertown. 
4 and 5. From Roya-hook to Peekskill, Westchester county. 
6. From Canaan, Columbia county, to Massachusetts line. 
7. From Verplanck’s point to Cruger’s point, Westchester county. 
PLATE XV. 
Fig. 1. Section from Lackawaxen creek to Port Jervis on the Delaware river, Sullivan and 
Orange counties. 
2. From Port Jervis to Ellenville, along the canal. 
3, From Ellenville to Newburgh. 
PLATE XVL 
Fig. 1. Section from Hudson city to New-Lebanon, Columbia county. 
2. From Wing’s corners in the southeast part of Dutchess county, to Poughkeepsie. 
3. From Hudson to the southeast corner of Canaan, Connecticut. 
