PHYSIOGRAPHY, 29

The Coharie Terrace.—The Ooharie Terrace, undeveloped in the
northern Coastal Plain, is found in the region to the east of the sand-
hills in Seotland, Robeson, Cumberland, Harnett, Sampson, J ohnston,
Wayne, Wilson, and Nash counties. Along its inner edge it has eleva-
tions of 220 to 235 feet, from which it slopes gradually to the eastward,
having elevations of 160 to 180 feet along its outer border, being often
much broken, as in Cumberland County, toward the valley of the Cape
Fear River. Broad interstream areas but little dissected occur in that
part of the area south of the Neuse River. The width of the terrace,
which in the larger areas reaches nearly 25 miles near the South Caro-
lina border, gradually decreases until it apparently disappears in Halifax
or Northampton counties, the last important development of it being in
Nash County. It is believed that a narrow area of the Coharie terrace
extends northwestward through Halifax County and possibly into North-
ampton.

The Sunderland Terrace.—The Sunderland terrace is found as a belt
extending throughout the district from the Virginia to the South Caro-
lina boundary, except where cut through by the reéntrants of the Wicom-
ieo terrace. Adjacent to the Coharie escarpment it has an elevation of
140 to 160 feet, from which point it gradually slopes eastward to an
elevation of 110 feet and at some points may even reach 100 feet.
Within the interstream areas broad undrained tracts are found, while
near the margins of the terrace, especially adjacent to larger river val-
leys, the surface is often deeply trenched.

The Sunderland terrace is found principally in Robeson, Columbus,
Bladen, Cumberland, Sampson, Duplin, Wayne, J ohnston, Greene, Wil-
son, Edgecombe, Nash, Halifax, and Northampton counties. The area
covered by the Sunderland terrace is much larger than that covered
by the Coharie, and gradually increases in width to the southward.
In the northern counties it is from 5 to 15 miles in width, but gradually
increases to fully 25 miles in the central counties, while in the Cape
Fear River district and toward the South Carolina line it is fully 40
miles wide in places.

The Wicomico Terrace.—The Wicomico terrace embraces a much
larger portion of the Coastal Plain than do the Coharie and Sun-
derland, similarly as this terrace in more northern areas embraces more
area than the Sunderland. It likewise forms deep reéntrants in the
older terraces, reaching in some of the valleys nearly if not quite to the
Piedmont border. This feature is especially-well seen in the valleys of
the Neuse and Cape Fear rivers. The elevation of the terrace near the
Sunderland escarpment is from 80 to 100 feet, while up the river valleys
farther to the westward it may reach 120 feet in elevation, as shown in