THE GEOLOGICAL HISTORY OF NEW YORK STATE 85 
that this late Tertiary reelevation notably affected the rest of the 
State. 
This inner gorge of the Hudson valley has been traced for fully 
100 miles eastward beyond the mouth of the present river. The 
Coast and Geodetic Survey has made a detailed map (see figure 28) 
of the ocean bottom near New York City, and the submerged chan- 
nel of the Hudson river is clearly shown as a distinct trench cut 
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Fic. 28 The submerged Hudson River channel, whose position is clearly 
shown by the contour lines. Figures indicate depth of water in fathoms. 
Data from Coast and Geodetic Survey. 
into the continental shelf. Even in the Hudson valley above New 
York City, the narrow inner rock channel has a depth of hundreds 
of feet (see plate 38) and is mostly submerged below tide water. 
Without any question this submerged Hudson channel was cut 
when the region was dry land, and thus we have positive proof 
that late in the Tertiary, and possibly extending into the early 
Quaternary, the region of southeastern New York was notably 
higher than it is today. Conservative estimates place the amount 
