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396 
[Nov. 20, 
Powell, “epigenetic” by Richthofen, and “inherited” by Shaler ; 
and they may be recognized even after the cover from whose slope 
they inherited their epigenetic courses, has been entirely consumed. 
Their discrimination from the simpler revived valleys is a mat- 
ter of interesting study, and is of manifest geologic as well as of 
geographic importance. Two special examples may be considered, 
in illustration of revived and superimposed streams . 1 
1 Figure 6 presents an outline of the drainage areas of northern and central New 
Jersey, that may serve as an index to locate the various streams referred to here and 
in later pages. The abbreviations are as follows : 
A. Assanpink. 
F. Flat. 
H. Hackensack. 
L. Lopatcong. 
M. Musconetcong. 
Ml. Millstone. 
Mn. Manalapan. 
P. Paulinskill. 
Pc. Passaic. 
Pg. Pohatcong. 
Pp. Pompton. 
Pq. Pequannock. 
Pt. Pequest. 
R. Raritan. 
Rn. Raritan, north branch. 
Rs. Raritan, south branch. 
Rk. Rockaway. 
Ro. Ramapo. 
Ry. Rahway. 
W. Wallkill. 
Wy. Whippany. 
The rectangular course of the Delaware on the west and the fjorded channel of the 
Hudson on the east are too well known to require naming. The shading of lines in va- 
rious directions indicates the several drainage basins, the linear forms of the Highland 
