270 THE COASTAL PLAIN OF NORTH CAROLINA.

ing the seaward portion of the Coastal Plain from the Neuse River to Mobile
Bay”)(p. 17)... -“ in North Carolina and Virginia the Columbia is little
more than a flowing mantle masking the more rugged framework of the older
Appomattox” (p. 32).

In 1898¢ Lewis Woolman described the occurrence of fossil molly
and diatoms in materials dredged from the bottom of the Disr
Swamp Canal and gave lists of the forms determined. He conch
that the deposits from which they were obtained are either of
Pliocene or early Pleistocene age. These beds are now referred to
Pleistocene. :
_ In their text-book which appeared in 1906, T. C. Chamberli
R. D. Salisbury? expressed the view that the Lafayette and |

of tlantic Coastal Plain y of fluvi

cordi interpretation, the deposits
ned surfaces bordering the coast. §
bowed-up regions to the west were unable to

ts across this flat region, and consequently «