424 THE COASTAL PLAIN OF NORTH CAROLINA.

 

JOHNSTON

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20 | Selma, } mile W. of....-_. | Selma Cotton Mills_______- 1904 _ jsea level, 168+ 6? _.-.-_.. —12
21 | Pine Level... ....22.2.--. ROWE ce ais ssp. Seb e a 160. sea level. 104+ 4? 202 —10
bey en Pine Level Oil Mill......-.-..-- “| 160 ‘sea level, 101 .__.)..----.. —10
Mitel SOM. Sheu cond pee scane Oliver, Godwin & Lynch __-/_..._- oon gee level.) 310° fcc Se he
Pep era y cess oes Ss Lyi MeARIS eis dase 1906 204 ‘sea level. 100 4? 70 —12+
S| SOE ea peel a Simmons Lumber ____._ 204 leea level.| 162 | 6 |.-.-----|..-.--
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JONES COUNTY.

Topography.—T wo Pleistocene terrace plains make up the surface
of this county. The southeastern part of the county is covered by the
Chowan plain, which varies in elevation from 25 to about 45 feet.
The remainder of the area is covered by the Wicomico plain at eleva-
tions of from 50 to 80 feet. The latter is somewhat dissected by Trent
River and its small tributaries, but there are broad interstream areas
which are very flat. Great Dover Swamp and Whiteoak Pocoson form
parts of this plain. The two terrace plains are separated by a scarp
which in places is well defined.

Geology.—Peedee beds, consisting of marine sands and clays, under-
lie the entire county, having a limited area of outcrop in the extreme
northwest, but coastward, passing deeper and deeper beneath overlying
Eocene beds belonging to the Trent formation. In this northwest re-
gion the Peedee formation is in turn underlain at a considerable depth,
perhaps 400 or 500 feet, by beds of the Black Creek formation. These
_ pass deeper beneath the Peedee beds in the direction of the coast.
The Trent beds are present over most of the county, becoming thicker
to the southeast. They consist for the most part of porous, siliceous
limestones, although there are interstratified sandy layers. At Pol-.
loksville along Trent River the formation contains a great bed of
oysters having a thickness of 12 to 15 feet, made up almost entirely
of the species Ostrea georgiana, a massive form which often exceeds 12
inches in length, Miocene sands and shell marls, which probably exist
as thin, disconnected sheets, rest upon the Eocene over at least parts
of the county. A thin covering of sands, sandy loams, and clays of
Pleistocene age, which belong in part to the Wicomico formation and

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