112 HISTORICAL SKETCH

and Chesapeake formations in Maryland. Tertiary fossils were col-
lected for Dr. Dall by Messrs. Harris and Burns in May, 1891, from
near Easton, Maryland, and in May and June, 1892, Mr. Burns was
sent to the Calvert Cliffs, Maryland, to obtain fossils for Dr. Dall.
Mr. Gilbert D. Harris, who accompanied Mr. Burns, made observa-
tions on the Tertiary formations in these cliffs, which led to his paper
on " The Tertiary Geology of Calvert Cliffs, Maryland. " ¹

In 1891-92 Messrs. Dall and Harris, in reviewing the literature and
knowledge of the Neocene in the United States, in " Correlation
Papers, Neocene, " wrote a short chapter on the Neocene of Maryland. ¹

Mr. G. D. Harris collected from some of the Eocene localities in
Maryland and Virginia and arrived at conclusions in regard to the
position of the deposits, which are set forth in a paper " On the
Geological Position of the Eocene Deposits of Maryland and Vir-
ginia. "³

The marine Cretaceous formations in Maryland received some study
from Professor C. A. White, who in May, 1888, made a trip through
eastern Maryland northward to examine the deposits. Probably these
observations had their influence in the preparation of the chapter on
Maryland and the District of Columbia, in Correlation Papers, Cre-
taceous. ⁴

In the latter part of 1891 Mr. T. W. Stanton and Mr. F. E. Willard
collected Cretaceous fossils in Prince George's county, Maryland.

In May, 1891, there was a joint scientific expedition into the tide-
water region of Maryland with representatives from Johns Hopkins
University, the Maryland Agricultural College, and the United States
Geological Survey. The survey was represented by Messrs. W J
McGee, N. H. Darton, G. D. Harris and David White. The party
traveled by boat along the Chesapeake Bay and the Patuxent and
Potomac rivers.

HYDROGRAPHIC WORK.

The hydrographic work of the United States Geological Survey in

¹ Am. Jour. Sci., 3d series, vol. 45, pp. 21-31.

² Bull. U. S. Geol. Survey No. 84, 1892, pp. 49-55.

³ Amer. Jour. Sci., 3d series, vol. xlvii, 1894, pp. 301-304.

⁴ Bull. U. S. Geol. Survey No. 82, 1891, pp. 38-90.