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 - . . - 16 



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 I'Eau, description of - - - - . - 129 



U. 



Unios, fossil, associated with coal plants - - - . -=111 



In the alluvial soil - - - . . - 117 



Recent, Wisconsin - - - - . - 123 



Do. St. Peter's - - - ... . i4g 

 V. 



Veins, mineral - - - - - - . -70 



Their nature fi 



Clay found in copper veins . - = . 72 



Metallic, general course of, in the United States - = 73 



Sulphuret of lead in Missouri - - - . 74 



J Flat veins . = . . - - 75 



At Gongo Soco 77 



Sulphuret of lead at Dubuque's and Galena - - 158 

 W. 



Wealden group, deficient in the United States - - = - 57 



Its remarkable organic remains - - - - 86 



Western waters, lowering of their ancient level - - - 117 



Do. do. - - - . - - 122 



Proofs of -.-. = = - 124 



Willa'a mountain, near Cumberland, Maryland, description of - - 104 



Z. 



Z!2ania aquatica, or wild rice, remarkable extent of ■= - - 121 



