MARYLAND GEOLOGICAL SURVEY 319

Gives fifteen local sections along the coast, and then in a generalized section of
these cliffs the author finds three fairly well-defined faunas: the " St. Mary's," the
" Jones Wharf" and the "Plum Point," and enumerates the species -which characterize
them, p. 30.

HILL, R. T. Clay Materials of the United States.

Mineral Resources U. S., 1891, Washington, 1893.

Rock koalin derived from the gneisses is reported from various localities in Cecil,
Anne Arundel, Harford, and less prominently in Montgomery, Howard, Carroll, and
Baltimore counties, p. 504. Also remarks on the different clays.

HOLMES, W. H. Distribution of Stone Implements in the Tide-
water Country.

Amer. Anth., vol. vi, 1893, pp. 1-14.

Discusses the difference in the character of the material brought down by the
Potomac and Patuxent rivers and shows its bearing on the paleolithic implements.

KEYES, C. R. Some Maryland Granites and their Origin. (Read
Dec. 1892.)

Bull. Geol. Soc. Amer., vol. iv, 1893, pp. 299-304, plate x.

Treats of Port Deposit, Texas, Windsor Road, Relay, Sykesville, Guilford, Garrett
Park, Woodstock, Ilchester, Ellicott City and Dorsey's Run granites. Proof of eruptive
origin, p. 302.

———— Surface Disintegration of Granite Masses.

Proc. Iowa Acad. Sci., vol. i, part iii, Des Moines, 1893, pp. 22-24.

Deals with the Jointing and spherical weathering of the Woodstock granites.

———— Some American Eruptive Granites.
Proc. Iowa Acad. Sci., vol. i, part iii, Des Moines, 1893, pp. 24-26.
Eruptive origin based on field relations, inclusions, contact phenomena and micro-
scopical examination.

———— Epidote as a primary Component of Eruptive Rocks.
Bull. Geol. Soc. Amer., vol. iv, 1893, pp. 305-312.

Through their relations with titanite, muscovite, and blotite the epidote and allanite
are shown to be primary.

KEYSER, W. Iron.

Maryland, its Resources, Industries and Institutions, pp. 100-112, Balti-
more, 1893.

An historical discussion of the industry in Maryland.

KEYSER, R. BRENT. Copper.

Maryland, its Resources, Indxistry and Institutions, pp. 112-120, Balti-
more, 1893.

An historical discussion of the Industry in Maryland.

NEWBURY, S. B. Natural and Artificial Cements.
Mineral Resources U. S., 1892, Washington, 1893.
Statistics on hydraulic cement, p. 730.