— epoch, elevation during, in the United States and California, xxxv, 245.
— of Massachusetts, xxii, 36.
— —, of Martha's Vineyard, vii, 240f; xxii, 36; xlvi, 318.
—, Hudson river formations, J. Finch, x, 227.
— of Lake Champlain, xxxvi, 27.
— of Ohio, xxxiv, 360.
— formations of Virginia, W. B. and H. D. Rogers, xxxviii, 182.
— of North Carolina, D. Olmsted, xiv, 231.
— of the southern Atlantic states, J. T. Hodge, xli, 332.
— shells of the United States, description of, T. A. Conrad, xxiii, 204, 339; xxviii, 109; xli, 344.f