DRAINAGE SYSTEMS AND THE GLACIAL PERIOD. 195 



1884 have brought to our knowledge the facts about this 

 submarine valley almost as clearly as those relating to the 







Fig. 50.— Map showing old channel and mouth of the Hudson (dewberry). 



inland portion of it above 'New York city. According to 

 Mr. A. Lindenko.hl,* this submarine valley began to be 

 noticeable in the soundings ten miles southeast of Sandy 

 Hook. The depth of the water where the channel begins 

 is nineteen fathoms (114 feet). Ten miles out the chan- 



* Bulletin of the Geological Society of America, vol. i. p. 564; 

 American Journal of Science, June, 1891. 



