38 



NEW YORK STATE MUSEUM 



southwest. In nearh' all cases the southern limb is steeper than 

 the northern, the fold in East Canada creek just north of Ingham 

 Mills being an exception. 



In addition to these larger folds, small ones appear in many 

 localities. These are best shown and most conspicuous in the 

 Lowville limestone, though by no means confined to that forma- 

 tion. Such folds are beautifully exhibited in the creeks about 

 Middleyille, many of which flow down their westerly pitching 

 sags. Plate 6 shows most excellently these slight folds as seen 

 in the quarry in the Lowyille limestone at Ingham Mills; but they 

 show almost equally well in a great number of localities and seem 

 as characteristic of the rocks hereabouts as are the larger folds. 



Faults 



The Little Falls fault is the most westerly of a series of large, 

 north-south breaks which cross the Mohawk yalley, and is the only 

 great fault within the map limits. The Dolgeville fault is of a 

 lower order of magnitude, though still a considerable break. The 

 Manheim fault (of the same order as the Dolgeville) lies just out- 

 side the map limits to the east. The second fault at Little Falls is 

 a small affair and likely simply a branch of the main fault, which is 

 very irregular and certainly branches somewhat, to the northward 

 of Little Falls. Three other quite insignificant faults haye been 

 detected by the writer, and quite likely others exist. It seems 

 yery unlikely that the Little Falls fault marks the westerly' limit 

 of faulting. White has in fact noted two faults in the Trenton 

 Falls district in addition to the one noted by Vanuxem, and quite 

 likely others will be forthcoming when detailed mapping is carried 

 northwestward.^ 



Little Falls fault. This fault was long ago described by 

 Yanuxem, and recently in more detail by Darton. The latter was 

 without an accurate base map on which to plot his results, and 

 also lacked our present knowledge of the thickness of the various 

 formations of the district, which is so largely due to Prosser's ex- 



n^anuxem, L. Geol. N. Y. 3d Dist. p.51-54. 

 White, T. G. N. Y. Acad. Sci. Trans. 15:80-81. 



