REPORT OF THE STATE PALEONTOLOGIST 1902 1077 



limb of a second anticline. That this was another similar fold 

 to the one discussed appears on comparing sections 14-20. It 

 is highly probable that the western end of section 15, from the 

 axis of the overturn fold now shown in the Coeymans near the 

 middle of the section [A], was of the type of those of section 20. 



Fig. 13 Overthrust fault with infolded Manlius (a) and Coeymans (6) 



If the latter section were added to the eastern half of section 15, 

 so that the extreme eastern end of 20 [A] coincided with the 

 axis of the overturn anticline [A, section 15] we would restore 

 what appears to have been the normal type of folding of this 

 region. Beginning on the east, there was a simple anticline 

 with the limbs nearly equal. This was followed by a broad 

 syncline, with a gentle westward dipping limb on the east and 

 a more abruptly eastward dipping western limb. The latter 

 formed the eastern limb of the overturned anticline, which had 

 almost become an isocline. The strata came up again in a broad 

 syncline with overturned eastern and low western limb, after 

 which they were again involved in an overturn anticline of the 

 same type as the preceding. A similar syncline to the last fol- 

 lowed, and was in turn succeeded by a third overturned anti- 

 cline in the Onondaga, as shown in section 21. The syncline 

 following this is of the same type as the two preceding; its 

 western limb, with an angle of 12° or 15° eastward dip, forms 

 the western side of Becraft mountain. We may safely assume 

 that three close overturned anticlines existed, besides the appar- 

 ently uniform anticline on the extreme east. The overthrust 

 fault no. 15, the direction of thrust of which was from the south- 

 west, produced a northward as well as eastward displacement 



