MARYLAND GEOLOGICAL SURVEY 303

———— Progress of Work on the Archean Geology of Maryland.

Johns Hopkins Univ. Cir. No. 65, vol. vii, 1888, pp. 61-63.
Sketch of Maryland geology and of the relations of the gneisses and eruptives about
Baltimore and thence northward.

1889.
ANON. Mining Notes.

Eng. and Min. Jour., vol. xlviii, 1S89.

Reference to Gold Mining at Great Falls (pp. 56, 2351.

BRYAN, O. N". The Cretaceous Formation of Southwestern Mary-
land.

Amer. Nat., vol. xxiii, 1889, pp. 713-714.

Deposits of Cretaceous age found to outcrop from beneath a covering of Eocene
strata. Certain beds at Fort Washington assigned to the Jurassic.

CLARE, WM. B. Discovery of fossil-bearing Cretaceous strata in
Anne Arundel and Prince George Counties, Maryland.

Johns Hopkins Univ. Cir. No. 69, vol. viii, 1889, pp. 20-21.

Description of type localities, enumeration of fauna and correlation with Lower
Marls of New Jersey.

CLARKE,- F. W. Report of work done in the Division of Chemistry
and Physics, 1886-87.

Bull. U. S. Geol. Surv. No. 55, 1889.

Also House Misc. Doc., 51st Cong., 1st sess., vol. xxxii, No. 244.

Two analyses of " Triassic Sandstone " from the Jaittelle quarry near Hancock
(this is not a Triassic sandstone) (p. 80), and one of lepidomelane from Baltimore (p. 14).

DUTTON, C. E. The Charlestown Earthquake of August 31, 1886.

9th Ann. Rept. U. S. Geol. Surv., 1889, pp. 363, 366, 369, 453.
Report of earthquake observations in Maryland, August 31, 1SS6.

FONTAINE, W. M. Potomac or Younger Mesozoic Flora.

Mono. U. S. Geol. Surv., No. 15, 1889, 377 pp., 180 plates.

House Misc. Doc., 50th Cong., 2nd sess., vol. xvii, No. 147.

(Rev.) Amer. Jour. Sci., 3rd ser., vol. xxxix, 1890, p. 520 (L. F. W.).

Introduction, p. 4. A description of some fossil plants from the neighborhood of
Baltimore, chiefly from Federal Hill and Ft. Washington, is given Including twenty-
five new species.

GANNETT, HENRY. Administrative Reports. Topographic Work
in Maryland.

9th Ann. Rept. U. S. Geol. Surv., 1887-88, Washington, 1889, pp. 52-55.

Gives notes as to time and men Involved in the surveying of Maryland for that
year.

GILL, A. C. Minerals from the chrome pits of Montgomery county,
Maryland.

Johns Hopkins Univ. Cir. No. 75, vol. viii, 1889, p. 100.
Description of Chrome—Tourmaline, Fuchsite and Rutile.