MARYLAND GEOLOGICAL SURVEY 279
1875.

ANON. The Maryland Coal Company's Cumberland Coal.

Eng. and Min. Jour., vol. xix, 1875, p. 1.

Partial table of production from 1842 to 1874. Approximate area of field is given.

FONTAINE, WM. M. On some Points in the Geology of the Blue
Ridge in Virginia.

Amer. Jour. Sci., 3rd ser., vol. ix, 1875, pp. 14-22, 93-101.

(Abst.) Geol. Record, 1875, London, 1877, p. 119.

Includes a few notes on Catoctin Mt., and the argillltes of Point of Rocks and Har-
per's Ferry, pp. 15-17. The first paper deals with some of the general problems involved
in a study of the Blue Ridge, and the illustrations are mostly taken from that portion
of the range, near the Potomac river. The second paper deals with the area about
Lynchburg and southward.

———— On the Primordial Strata of Virginia.
Amer. Jour. Sci., 3rd ser., vol. ix, 1875, pp. 361-369, 416-428, 3 figures.
(Abst.) Geol. Record, 1875, London, 1877, p. 119.

Refers briefly to the geology of Harper's Ferry (p. 362) and to the folds at " Cement
Mill " near Hancock (p. 364). Geology of the Harper's Ferry region, pp. 422-423.

GENTH, F. A. Geological Report of the Maryland " Verde An-
tique " Marble and Other Minerals on the Lands of the Havre Iron
Co., in Harford County, Maryland. Univ. of Penn., 1875, 9 pp.

Description including sketch map of property.

GILLMORE, Q. A. Report on the Compression Strength, Specific
Gravity, and ratio of Absorption of the Building stones in the United
States.

Rept. Chief of Engineers U. S. Army, part ii, appendix II, pp. 819-851.
Same separately, 8vo, 37 pp., New York, Van Nostrand, 1876.

JOHNSTON, CHRISTOPHER, About the rediscovery of the " Bermuda
Tripoli " near Nottingham, on the Patuxent, Prince George's County,
Md.

Proc. Boston Soc. Nat. Hist., vol. xvii, 1875, pp. 127-129.

Short account of forms found and the correlation of the old " Bermuda earth " with
the newly found locality.

MACFARLANE, JAMES. The Coal Regions of America. 8vo. 3rd
edit. 1875. (1st 1873.) .

The author gives a compilation of the available data on the Cumberland coal area,
pp. 237-261.

PRIME, F., JR. On the Occurrence of the Brown Hematite De-
posits of the Great Valley.

Trans. Amer. Inst. Min. Eng., vol. iii, 1875, pp. 410-422.
Eng. and Min. Jour., vol. xx, 1875, pp. 285-298.