Report of the geological exploration of the fortieth parallel (1870)
United States Geological Exploration of the Fortieth Parallel (1867-1881), King, Clarence, 1842-1901, Hague, A. (Arnold), 1840-1917, Emmons, Samuel Franklin, 1841-1911, Hague, James D. (James Duncan), 1836-1908, Meek, F. B. (Fielding Bradford), 1817-1876, Hall, James, 1811-1898, Whitfield, R. P. (Robert Parr), 1828-1910, Ridgway, Robert, 1850-1929, Watson, Sereno, 1826-1892, Eaton, Daniel Cady, 1834-1895, Bien, Julius, 1826-1909, engraver · (Washington, D.C. : G.P.O.) · leaf 821
aiv- ai^^ V, -^«* lucb. ;i\rT7 IlrrjiTr.ni: I IC K- —^%t BASALTS. 677 are of the ordinary feldspar variety, and poor in the globulitic or glassybase. The triclinio feldspars are correspondingly large, and the olivinessmall. At the entrance of the canon, opposite the andesite flows which form…
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