164 &quot; INDEX. 



Page. 



Castle rock, a curious pillar of sandstone - 133 



Chains, transition, general magnetic range - 43 



Mountain, their respective chronologies - - 68 



Chalk, deficient in the United States - 21 



Remarkable remains of this formation 22 



Clay, slate - 31 



Coal, bituminous, resting on unconformable rocks - 42 



Beds not dislocated in the, United States - - 50 



Found in Poland above the muschelkalk - - 52 



At Frostburg, Maryland - 105 



Remarkable locality near Savage river, Potomac - - 106 



Manner of shipping- it at Sunderland - 107 



Estimate of its area in Pennsylvania - - 110 



Its quality dependent on vegetable species - - 113 



At Rock river, Mississippi - 159 



Column, geological - 24 



Conglomerates, origin of - 69 



Copper, carbonate of, on the Wisconsin - 124 



At Mineral point - - 159 



Coteau de Prairie, reconnoissance from Washington to - 95 



Apparent height - - 153 



Adjacent country - - 154 



Route to the Missouri - 155 



Cotoctin mountains - - 98 



Cretaceous group, partly deficient in the United States - 58 



D. 



Diamonds in geodes - - 78 



E. 



Eatatenka lake - 156 



F. 



Falls of St. Anthony, heard from near St. Croix river - - 134 



Description of - 136 



Fault, meaning of the term - 72 



Great extent of - 113 



Formation, explanation of - 19 



Fort Snelling, geology of - 135 



Fort Winnebago, geology of - 122 



Fossils of equivalent strata, why not identical - - 92 



Calamites, &c. on the Potomac 97 



In beds at Licking creek, Maryland - 102 



Fucoides Alleghaniensis, remarkable position of - 104 



At Bedford springs, Pennsylvania - - 109 



