Part 27

Footnote 25:

Powell, J. W., Exploration of the Colorado River of the West, 1875. For Powell’s preliminary article see this Journal, =5=, 456–465, 1873.

Footnote 26:

McGee, W. J., Three formations of the Middle Atlantic slope, this Journal, =35=, 120, 328, 367, 448, 1888.

Footnote 27:

Davis, W. M., Topographic development of the Triassic formation of the Connecticut Valley, this Journal, =37=, 423–434, 1889.

Footnote 28:

Percival, J. G., Geology of Connecticut, 1842.

Footnote 29:

Kerr, W. C., Origin of some new points in the topography of North Carolina, this Journal, =21=, 216–219, 1881.

Footnote 30:

McGee, W. J., The classification of geographic forms by genesis, Nat. Geogr. Mag., =1=, 27–36, 1888.

Footnote 31:

Davis, W. M., The rivers and valleys of Pennsylvania, Nat. Geogr. Mag., =1=, 183–253, 1889.

——, The rivers of northern New Jersey with notes on the classification of rivers in general, ibid., =2=, 81–110, 1890.

Footnote 32:

Silliman, Benjamin, Notice of Horace H. Hayden’s geological essays, this Journal, =3=, 49, 1821.

Footnote 33:

Cornelius, Elias, Account of a singular position of a granite rock, this Journal, =2=, 200–201, 1820.

Footnote 34:

Finch, John, On the Celtic antiquities of America, this Journal, =7=, 149–161, 1824.

Footnote 35:

Finch, John, Geological essay on the Tertiary formations in America, this Journal, =7=, 31–43, 1824.

Footnote 36:

Conybeare and Phillips, Outlines of the geology of England and Wales, this Journal, =7=, 210, 211, 1824.

Footnote 37:

Hayden, Horace H., Geological essays, 1–412, 1821, this Journal, =3=, 47–57, 1821.

Footnote 38: