166 



INDEX. 



Page. 



Limestone, extends to the North mountain - - . . 102 



Fine anticlinal section . . . . . iqq 



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 - - 06 



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, lake, origin of ------ - 133 



Potomac, valley of - - - - - - - 41 



Disposed into anticlinal and synchnal lines - - - 41 



Pot-holes, origin of - - . . - - - - - 96 



