36 



Report of the State Geologist. 



rock 200 feet high. This formation constitutes another terrace 

 surmounted in turn by a low terrace of Trenton and Birdseye 

 limestones and rounded slopes of Utica slate. These terraces all 

 slope southwestward with the dip of the formations and 

 merge in succession into the bottom of the valley above Little 

 Falls. The terrace on the surface of the crystalline rocks is 

 wider on the north side than on the south side of the gorge, and 

 it is on this wider terrace that the village of Little Falls is built ; 

 about midway through the gorge. The following section is 

 through the central portion of the village, and illustrates the 

 relations of the terraces, although they are here somewhat 

 diminished in altitude above the river. In figure 3 they are 

 shown in their maximum altitude. 



Figure 2.— Sections across the gorge of the Mohawk at Little Falls, N. Y., looking westward. U. 

 Utica slate. T. Trenton and Birdseye limetones. C. Calcif erous. A. Archean. Vertical scale some- 

 what exaggerated. 



About two miles above Little Falls the Calciferous terrace and 

 cliff gradually disappear beneath the river, the valley widens 

 and the slopes of Utica slate extend to its bottom. The 

 relations along the fault plane are shown in figure 3. 



Figure 3.— Sections along the fault plane from southeast of Little Falls to north of Salisbury- 

 Centre. U. Utica slate. T. Trenton and Birdseye limestones. C. Calciferous. A. Archean. S. Salis- 

 bury Centre. I. Eastern face of uplifted block. II. Western face of downthrown block from the 

 east. Vertical scales somewhat exaggerated. 



