62 THE COASTAL PLAIN OF NORTH CAROLINA.

1888.

HEILPRIN, ANGELO. The Classification of the Post-Cretaceous Deposits. Proc.
Phila. Acad. Nat. Sci., 1887, pp. 314-322, 1888.
The author again refers to the Miocene of the Atlantic Coastal Plain as

consisting of the three divisions: “Marylandian,” ‘‘Virginian,” and ‘‘Caro-
linian.”

McGrz, W J—Three Formations of the Middle Atlantic Slope. Amer. Jour.
Sci., 8d series, vol. 35, 1888. Potomac Formation, pp. 120-148. Appo-
mattoxr Formation, pp. 328-330. Columbia Formation, pp. 367-388, 348-366.

Materials exposed on Roanoke River near Weldon, which he regards
aS representing the Potomac formation of Virginia, are described (p. 126).
This is the only reference to Potomac equivalents in North Carolina.

Concerning the presence of the “Appomattox” formation in North Caro-
lina he says: “And at Weldon it rests upon deeply ravined erystalline rocks,
Save where inconspicuous remnants of Potomac arkose intervene” (p.
330). The formation is said to be the equivalent of at least a part of the
“Orange Sand” of Hilgard. As regards the age of the formation, he states
that “It is manifestly newer than the fossiliferous Miocene upon which it
rests, and older than the Columbia formation by which it is overlain”
(p. 330).

The Columbia formation is divided into the Fluvial Phase and the Inter-
fluvial Phase. Both phases are mentioned as occurring along the Roanoke

River in North Carolina. Terracing is mentioned as occurring along
Roanoke River in the vicinity of Weldon.

PENROSE, R. A. F., Jn.—wWature and Origin of Deposits of Phosphate of Lime,
with an introduction by N. 8. Shaler. Bull. U. S. Geol. Surv., No. 46, 143 _
pp., 3 pls. Washington, 1888. 3

Brief descriptions with chemical analyses are given of the character
and occurrence of amorphous nodular phosphates in North Carolina. They.
occur in Duplin, Sampson, Onslow, Pender, New Hanover, and Columbus
counties. The most valuable deposits occur at Castle Hayne and near
Wilmington, and these are briefly described (pp. 70-75).

1889.

FonTainz, WM. M.—The Potomac or Younger Mesozoic Flora. U. 8. Geol.
Survey, Monograph XV, 2 vols. 1889. ‘Text 377 pages.

Describes the deposit of supposed Potomac at Weldon as consisting of

a thin layer of sands and gravels resting directly upon the crystalline

rocks. He believes it referable to the Potomac upon lithologic grounds.

He says: “It suggests the idea that the Potomac may be found as far

South as this place. The exposure, however, is too slight to be taken

as anything more than suggestive of probabilities” (pp. 45-46).

Hormes, J. A—Historical Notes Concerning the North Carolina Geological
Surveys. Elisha Mitchell Sci. Soc. Jour., vol. 6, Pt. I, January-June, 1889,
pp. 5-19. Ae : ae

Gives a brief account of the several North Carolina State surveys that
have been called Seological surveys, including lists of publications.