306 BIBLIOGRAPHY AND CARTOGRAPHY

ASHBURNER, CHAS. A. Coal.

Mineral Resources U. S., 18SS, Washington, 1890.

Statistics, pp. 169, 171, 206, 280-283. See also pp. 175, 181, 182.

BROWNE, WM. H., and RITCHIE, ALBERT. Report of the Com-
mittee on the Western Boundary of Maryland.

Md. Hist. Soc. Fund Pub., No. 29, 40 pp. Baltimore, 1890.

CHAMBERLAIN, THOS. C. (Some Additional Evidences Bearing on
the Interval between the Glacial Epochs.)

Bull. Geol. Soc. Amer., vol. i, 1890, pp. 469-480.

During the discussion the terraces of the Monongahela et als. are discussed. The
author considers them due to river erosion.

CHESTER, F. D. The Gabbros and Associated Rocks in Delaware.

Bull. U. S. Geol. Surv. No. 59, Washington, 1890.
House Misc. Doc., 51st Cong., 1st sess., vol. xxxii, No. 244.
(Abst.) Amer. Nat., vol. xxv, p. 1002.

Refers to similar rocks in Maryland and shows an areal distribution in Cecil
county and exhaustive study of the gabbroic rocks in Delaware, pp. 7, 27, 36.

CLARK, WM. B. Third Annual Geological Expedition into South-
ern Maryland and Virginia.

Johns Hopkins Univ. Cir. No. 81, vol. ix, 1890, pp. 69-71.

Describes the Eocene section of the Potomac River valley in Maryland and Virginia.

CLARKE, E. W. Report of work done in the Division of Chemistry
and Physics, 1887-88.

Bull. U. S. Geol. Surv. No. 60, 1890, p. 159.

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

Analyses of white dolomitic marble from Cockeysville, by J. E. Whitfield.

———— Report of work done in the Division of Chemistry and
Physics, 1888-89.

Bull. U. S. Geol. Surv. No. 64, Washington, 1890.

House Misc. Doc., 51st Cong., 2nd sess., vol. xv, No. 126.

Analyses of chrome—tourmaline and fuchsite from Etchison P. O., Montgomery
county, by T. M. Chatard, p. 41. Of pyroxenltes and smaragdlte from Baltimore county,
by J. E. Whltfleld, p. 42. Of pyroxenltes and dlallage bronzlte rock from same region,
by T. M. Chatard, p. 43.

DALL, WM. H. Contributions to the Tertiary Fauna of Florida.
Trans. Wagner Free Inst. Sci., Phila., vol. iii, 1890-1895, 570 pp.
Gives the descriptions and figures of many Maryland forms.

DAY, D. T. Abrasive Materials.

Mineral Resources U. S., 1888, Washington, 1890.

Statistics for year on Lyons Creek Mine, near Dunkirk, Calvert- county, p. 578.