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AX AMERICAN GEOLOGICAL KAIL WAY GUIDE. (X.Y.) 



48. On either side of the valley, according to Prof. Hall, is the following section : Pyritiferous 

 shales, (Clinton group) ; Coralline limestone, (Niagara) ; Waterlime, (Salina); Tentaculite; Pentam- 

 erus; Delthyris shaly limestone; Upper Pentamerus, (Lower Helderberg); Oriskany; CaudaGalli; 

 Schoharie grit; Onondaga limestone, (Upper Helderberg). At Vromans are cliffs of Hamilton, 

 " Vroman's Nose." 



49. The Schoharie grit formation was named from this place. The fossils peculiar to it are 

 found in the mountain one and a half miles northwest and northeast of Schoharie. 



50. See from car windows the great falls of Mohawk, 70 feet high, over Hudson River slate. 



51. Whitehall is usually called the head of Lake Champlain, but the lake for 15 miles is rarely 

 more than 100 to 150 yards wide. It is in fact a mere channel between mud flats and clayey alluvium. 

 Like Champlain is 112 miles long, 600 feet deep, and the surface being only 96 feet above tide, it 



