34 



NEW YORK STATE MUSEUM 



Although the Beekmantown is not exposed within the map 

 Hmits there is no question regarding its presence as an overlapping 

 formation. In the northwest corner of the quadrangle, along 

 Black river, the Lowville and Precambric are so close together 

 as to preclude the presence of Beekmantown. Near the south 

 boundary at Cold brook, the Beekmantown is exposed and doubt- 

 less extends northward under the Trenton. In the wells to the 

 south and southwest at and near Utica and at Rome, the Beekman- 

 town is present showing a thickness which is not accurately known, 

 but which is quite certainly at least several hundred feet. Passing 

 northwestward from these wells to the Precambric boundary the 

 Beekmantown shows a diminution in thickness from several 

 hundred feet to nothing, which is just what would be expected in 

 the case of overlap. 



LeveT 



/4^= Gre MvtUe, Sy» Syenite. Sy a= Gj-ehvi Ut-Syehite. St= Trenton. Sh=-Ut ic« -Lorr<^i,he. 

 Hoi-; 1. scaXe ; X.inch= JUiUe , Ve»-t. Scale.' 1 i nch =14.00 fee t. 



Fig. 5 Structural section across the region passing from Starr hill east-northeast and through 



Ash ridge 



Within the map limits the Trenton formation, so far as can be 

 determined, everywhere rests upon the Precambric, along the Pre- 

 cambric boundary. Along Black river, in the northwestern part 

 of the quadrangle, the Lowville may be seen practically in contact 

 with the Precambric. Thus the facts clearly show that the Trenton 

 overlaps the Beekmantown upon the Precambric. 



The Trenton shows a thickness of 510 feet in the Globe Woolen 

 Mill well at Utica, 575 feet in the Chittenango well, and 435 feet 

 (including the Lowville) in the Rome well. Within the Remsen 

 quadrangle the maximum thickness of the Trenton including the 

 Lowville is about 300 feet. Along the Precambric boundary 

 there is strong evidence to show that the thickness of the Trenton is 

 much less. Such evidence may be found along the line between 

 Bardwell Mill, where upper Trenton is shown, and the mouth of 

 Little Black creek where Precambric outcrops. When the differ- 

 ence in elevation and the greatest possible slope of the Precambric 

 surface between these points are considered, it is evident that no 



