166 INDEX. 



Page. 



Limestone, extends to the North mountain - 102 



Fine anticlinal section - 108 



Galeniferous - - - 123 



Do. on sandstone - - 124 



Fawn-colored, on the St. Peter's, at Abert's run - - 139 



M. 



Makato, or Blue-earth river - - 142 



Fabulous account of copper mines disproved - 145 



Map, geological, importance of, to the United States - - 13 



Metalliferous rocks -'. - -70 



Michigan lake, sandstone of Fox islands - 119 



Michilimackinac, geology of - 118 



Millstone grit and shale, localities in the United States - - 49 



Near Shellburg, Pennsylvania - 109 



Mississippi, Upper, physical geography of - 126 



Murchison, Mr., his new arrangement of the transition beds - 23 



N. 



Nacotah Indians, meaning of their name - 138 



Give names to localities from particular incidents - - 139 



Nomenclature, founded on natural principles - - 19 



O. 



Ocean, once covered the earth - - 64 



Dry land a result of the raising of its beds - 65 



Successive periods at which they have been upheaved - 66 



Consequences of the displacement of its waters - 69 



Oolitic series, deficient in the United States - 55 



Description of 56 



Old red sandstone divided into three parts by Mr. Murchison - - 56 



Organic bodies, definition of 13 



General affinity of, in the older rocks 79 



Some species identical in distant parts of the earth - 81 



New arrangement of fossil fish by M. Agassiz - 81 



Fossil plants 82 



Serve to identify rocks - 84 



General progression of 84 



Earliest remains of terrestrial mammalia - 85 



P. 



Pebbles, origin of 14 - 



Pepin, la'ke, origin of - - 133 



Potomac, valley of - 41 



Disposed into anticlinal and synclinal lines - - 41 



Pot-holes, origin of - 96 



