802 THE COASTAL PLAIN OF NORTH CAROLINA.

sea or not cannot be with certainty determined. It is significant, how-
ever, that deposits of Sunderland age have never been observed beneath
the cover of later Pleistocene deposits throughout the eastern portion
of the Coastal Plain district. Furthermore, there are numerous in-
stances where valleys of Sunderland time have been buried by the ma-
terials of the next lower or Wicomico terrace. Every gradation is
found from uneroded valleys to those in which the later materials have
been swept out and the older valley lines widened and extended at the

= headwaters by renewed erosion. Again, many instances are found

_ where the Wicomico sea, during the formation of the Wicomico ter-
fees reduced the headlands formed of Sunderland and earlier deposits.

reduction in the more diversified outline may well have been pro-
e by th advance of a sea over the region, although neither this
the precedi a effects would necessarily demand extensive sub-

Come encircles the Sunderland terrace wherever

Sp pos ere es ay

ef ete stan internal structure, suggest the