156 NEW YORK STATE MUSEUM 



point on a line perpendicular to the chords of these arcs. There 

 is other evidence of an uplift of the east face of the Trenton where 

 it lies near the fault plane, and this evidence we will now examine. 



In figure 3 at c, d, e and f, there has been a strong upward bend- 

 ing of the Trenton beds just at the south of a clearly shown but 

 minor fault plane. The beds at the right of this minor fault had 

 their edges dragged down by the load which resisted the upward 

 movement. At g and h still another minor fault plane is shown and 

 the beds again have their edges dragged up on the south side. Near 

 the northern end of this Trenton exposure the beds are again 

 dragged up but here a little brook found an easy place in which to 

 cross the barrier and it long since carried away all local trace of 

 the fractured Trenton material. By taking a boat and going around 

 the southern point of the bay we may note that the dip of the 

 Chazy beds, near the fault plane, has also been altered by this 

 local uplift. 



If now we ask ourselves why late in the history of this fault 

 the Trenton next it should have been lifted and tipped westerly 

 we shall have to refer the movement to some period of great and 

 extensive thrust from the east, such as that which existed during 

 the Taconic or Appalachian revolutions. At these times mighty 

 forces made themselves very manifest and threw many of the 

 sediments of eastern North America into great folds. During 

 these ancient, geologic revolutions old Adirondackia tried to play 

 the part of a buffer state and remain neutral. When at last 

 Vermont was conquered and compelled to join the attacking forces 

 in the attempt to overrun New York territory she actually moved 

 her boundaries from 10 to 30 miles westerly. The more solid 

 Chazy rocks have shown less evidence of this revolution than the 

 Trenton, which still plainly shows the effects of the ancient struggle. 



The reader may perhaps say, "If there has been such a great 

 dislocation of the rock foundations of Cliff Haven involving a 

 downthrow on the north of, say 600 feet, why is it that the cliff 

 at the south is not a sheer precipice now 600 feet high? If the 

 Chazy on the north side of this fault is now covered by beds of the 

 Lowville, Black River and Trenton formations, why do we not 

 also find the same formations covering the whole Bluff Point or 

 Chazy mass on the south ? " These questions open the door to an 

 interesting field of nature study. 



So soon as any land mass is elevated it begins to feel the search- 

 ing influence of the wind, and this robber not only carries away 

 all the loose materia! that it can lift, but it uses this material to 



