Delaware river: evidence for its former extension to wilmington submarine canyon.
Seismic-reflection profiles indicate that during the Pleistocene the Delaware River flowed across the continental shelf east of Delaware Bay and emptied into Wilmington Submarine Canyon. The ancestral valley (width, 3 to 8 kilometers; relief, 10 to 30 meters) is buried, is not reflected in the surface topography, and probably predates the formation of the present canyon head.
Twichell
D C
DC
Knebel
H J
HJ
Folger
D W
DW