168 INDEX 



Page. 



Strata, correspondence of, on the sides of streams and valleys - . 15 



Systematic succession of - - - - 15 



Inorganic - - - 16 



Organic and aqueous origin of - . ]fi 



Causes of their deficiency - - 20 



T. 



Tertiary order - - 59 



Localities in the United States . 62 



Basin of Paris - - 89 



Quadrupeds and vegetation of - 90 



Trap, an intrusive rock - -17 



Curious exhibition of . 17 



Trempe a 1 Eau, description of - - . 129 



U. 



Unios, fossil, associated with coal plants - 111 



In the alluvial soil - 117 



Recent, Wisconsin 123 



Do. St. Peter s - 148 



V. 



Veins, mineral &amp;gt;. 70 



Their nature -&quot; - 71 



Clay found in copper veins , . 72 



Metallic, general course of, in the United States . 73 



Sulphuret of lead in Missouri - - 74 



Flat veins ^ 75 



At Congo Soco - - 77 



Sulphuret of lead at Dubuque s and Galena - - 158 



W. 



Wealden group, deficient in the United States - - 57 



Its remarkable organic remains , &quot; * 86 



Western waters, lowering of their ancient level - 117 



Do. do. - 122 



Proofs of - - 124 



Wills s mountain, near Cumberland, Maryland, description of - - 104 



Z. 



Zizania aquatics, or wild rice, remarkable extent of - - 121 



