MARYLAND GEOLOGICAL SURVEY 283

come from the northwest, from Maryland and Pennsylvania, sometimes a distance of
40 miles, with the boulders Increasing in coarseness to the sonthward. Reference to the
" Iron ore clays " of Maryland, pp. 155-157. The papers also Include numerous observa-
tions on the overlying gravels, with a correlation.

FRAZER, PERSIFOR, JR. Classification of Coals. (Read May, 1877.)

Trans. Amer. Inst. Min. Eng., vol. vi, 1879, pp. 430-451.

The ratios of volatile to fixed combustible matter is given for several Cumberland
coals (after W. R. Johnson).

———— [The Lake Superior Copper Rocks in Pennsylvania.]

Trans. Amer. Inst. Min. Eng., vol. vii, 1879, pp. 336-339.

Quotes from Report CC (Second Geological Survey of Pennsylvania) and other

articles. Holds that South Mountain Is separate from Primal of Rogers and that the

rocks found there are not Igneous.

———— The Mesozoic Sandstone of the Atlantic Slope.

Amer. Nat., vol. xiii, 1879, pp. 284-292.

Review of three papers—Heinrich, Mesozoic formations of Va., Trans. Amer. Inst.
Min. Eng., 1878; Fontaine, Notes on Mesozoic of Va., Amer. Jour. Sci., 1879; Russell,
On the Physical History of the Trlassic, Annals N. Y. Acad. Sci., 1878.

FRAZER, PERSIFOR, JR. Fossil (?) Forms in the Quartzose Rocks
of the Lower Susquehanna, with plate. (Read Apr. 4, 1879.)

Proc. Amer. Phil. Soc., vol. xviii, 1880, pp. 277-279.

Deals with some curious Indeterminate forms from Frazer's Point, Cecil county.
Letters by Whitfield and Hall.

HEINRICH, OSWALD J. The Mesozoic formation in Virginia.
(Read Feb. 1878.)

Trans. Amer. Inst. Min. Eng., vol. vi, 1879, pp. 227-274.

The author recognizes four divisions very nearly parallel running from S. 30° to W.
37°, which are described. Distinguishes conglomerates, sandstones, slates, shales, lime-
stones and coal. Apparently considers that the formation extended to New Market,
Westminster and Strassburg (p. 250). Maps and sections.

HUNT, T. STERRY. (On the Geology of the Eozoic Rocks of North
America.)

Proc. Boston Soc. Nat. Hist., vol. xix, 3879, pp. 275-279.

McCREATH, ANDREW A. Second Report of Progress in the Lab-
oratory of the Survey at Harrisburg.

Rept. 2nd Geol. Surv. Pa. MM, Harrisburg, 1879.
Contains analyses of Maryland materials, pp. 29, 266, 269.

PRIME, FREDERICK. A Catalogue of Official Reports upon Geo-
logical Surveys of the United States and Territories and of British
North America.

Trans. Amer. Inst. Min. Eng., vol. vii, 1879, pp. 455-525.

A partial list of publications relating to Maryland, corrected in 1881, which see.