MARYLAND GEOLOGICAL SURVEY 317

———— Iron Ores.

Mineral Resources U. S., 1892, Washington, 1893.

Statistics nnd remarks on production, character of ores and workings, pp. 2G, 34,
37, 43.

BOYLE, C. B. A Catalogue and Bibliography of North American
Mesozoic Invertebrata.

Bull. U. S. Geol. Surv. No. 102, 1893, pp. 1-313.

House Misc. Doc., 52nd Cong., 2nd sess., vol. xxiv, No. 7.

CLARK, WM. BULLOCK. The Available water power of Maryland.
Monthly Rept. Md. State Weather Service, vol. iii, 1893, pp. 7-9.
Many facts on drainage areas and streams.

———— Physical Features [of Maryland], pp. 11-54 of Mary-
land, its Resources, Industries and Institutions. Baltimore, 1893.

A broad review and discussion of the leading topographical features of the eastern
United States and especially Maryland.

———— The Leading Features of Maryland Climate.
Monthly Rept. Md. State Weather Service, vol. iii, 1893, pp. 1-6.
Discussion of the temperature, precipitation, humidity, winds and barometric
pressure.

———— The Annual expedition of students in geology, 1892.
Johns Hopkins Univ. Cir. No. 103, vol. xii, 1893, pp. 53-54.
Itinerary of trip and description of localities visited.

———— The Mesotoic Echinodermata of the United States.

Bull. U. S. Geol. Surv. No. 83, 1893.

House Misc. Doc., 52nd Cong., 1st sess., vol. xx, No. 336.

CLARKE, F. W. Report of work done in the Division of Chemistry
and Physics, 1891-92.

Bull. U. S. Geol. Surv. No. 113, 1893.

House Misc. Doc., 52nd Cong., 2nd sess., vol. xxiv, No. 7.
Analyses of feldspars from Jones Falls, Baltimore (110); ottrelitc from Liberty,
Frederick county (111); piedmonite from Pine Mt., Monterey, I'a. (111).

DARTON, N. H. The Magothy Formation of Northeastern Mary-
land.

Amer. Jour. Sci., 3rd ser., vol. xlv, 1893, pp. 407-419, map.

An arenaceous deposit, probably identical with the " alternate clay sands " of Uhler,
and lying between the Albirupean series of the Potomac and the bottom of the marine
Cretaceous.

———— Cenozoic History of Eastern Virginia and Maryland.

Bull. Geol. Soc. Amer., vol. v, 1893, p. 24.

(Abst.) Amer. Jour. Sci., 3rd ser., vol. xlvi, 1893, p. 305.