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

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

[28]. Percival, J. G., Geology of Connecticut, 1842.

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

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

[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.

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

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

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