MARYLAND GEOLOGICAL SURVEY 237

1814.

GILMOR, ROBT., JR. A Descriptive Catalogue of Minerals occur-
ring in the vicinity of Baltimore, arranged according to the distribu-
tion methodique of Hauy.

Bruce Min. Jour., vol. i, 1814, pp. 221-232.

Enumerates 43 minerals found within a range of 12 miles, " except in a few
Instances where the minerals were too interesting to pass unnoticed." Says Cathedral
was built of granite from Falls of Patapsco about 10 miles out on the Frederick turnpike
(p. 232).

1815.

MITCHILL, SAMUEL L. A detailed Narrative of the Earthquakes of
1811, 1812 and 1813 [abbreviated title]. (Read April 14 and May
12, 1814.)

Trans. Lit, and Phil. Soc. N. Y., vol. i, 1815, pp. 284-307.

Describes the phenomena as observed in Maryland, and suggests that the effects
did not extend northeast of Maryland.

1816.

CLEAVELAND, PARKER. An elementary treatise on Mineralogy and
Geology. 6 plates. 8vo. 668 pp. Boston, 1816.

Frequent reference to Maryland minerals.

1817.

MACLURE, WM. Observations on the Geology of the United States
of America, with some remarks on the effect produced on the nature
and fertility of soils by the decomposition of the different classes of
rocks. With two plates. 12mo. Phila., 1817.

A classic work giving many references to the limits and character of the geo-
logical formations in Maryland. The text and map (120 m. to the Inch) represent the
Cretaceous extending southwest to the Susquehanna only. All land to the southeast
of " Primitive " is " Alluvium " in Maryland. Pages 105-107 deal especially with
Maryland.

1818.

MACLURE, WM. Observations on the Geology of the United States
of America, with some remarks on the probable effect that may be
produced by the decomposition of the different classes of Rocks on
the nature and fertility of Soils. Two plates.

Republished in Trans. Amer. Phil. Soc., vol. i, n. s., 1818, pp. 1-91.

MITCHILL, SAMUEL L. Cuvier's Essay on the Theory of the Earth.
To which are now added Observations on the Geology of North Am-
erica. 8vo. 431 pp. Plates. New York, 1818.

Numerous local references especially about Harper's Ferry 1339-344), Eastern
Shore (393-304), Washington (395-307). The book contains three figures of an elephant's
tooth from Maryland.