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NEW YORK STATE MUSEUM 



to the west just above the mouth of Wappinger creek, and ex- 

 tending to the west of Xewburg as above indicated. 



It is worthy of remark here that the United States Coast Survey 

 soundings of the bottom of the Hudson show a well marked ridge 

 crossing the Hudson from the north side of Sherman's dock 

 about 1 mile north of the steamboat landing at Newburg in a 

 northeasterly direction to the east shore. Over this ridge the 



Fig. 13 Sketch map of the bed of the Hudson near Newburg N. Y., showing bar 

 crossiug the bottom of the Hudson. Figures indicate depth of water in fathoms. Con- 

 structed from United States Coast Survey chart no. 371 



depth of water is 6 fathoms. Xorth and south of this bar the 

 channel falls off to depths of 1\ on the north and 8 fathoms on 

 the south and these depths are maintained for several miles up 

 and down the river. There is no reason for supposing that this 

 bar is a normal feature of the development of the river, and it 

 is explicable apparently on one of two hypotheses, either that it 

 is due to a reef of rock less eroded than the rocks north and 

 south by glacial action in the channel or that it is a deposit made 



