vi LETTER TO THE SECRETARY. 



Stations and Randolph County, Utah, are most of them different from those 

 of Florissant, Mouth of White River, and Elko. These plants are repre- 

 sented by twenty-one plates, and their relation is indicated with the flora of 

 the Gypses of Aix in France, which is generally regarded as lowest Miocene 

 or Oligocene. ^The table of distribution of these plants includes, in America, 

 those of Florissant, Elko, Green River Station, Alkali Station, Sage Creek, 

 and Barren Springs as compared with the Miocene of Greenland, Alaska, 

 the Oligocene of France and Germany, and the Miocene of Europe. 



The fourth part relates to Miocene plants described from specimens 

 obtained from the Bad Lands, California, and Oregon, and from Alaska, 

 and they occupy fifteen plates. There is also a table of distribution that 

 indicates the relations of these species of Alaska, Carbon, Washakie, the 

 Bad Lands, Oregon, California, and Fort Union with the Arctic Miocene, 

 Greenland, Spitzbergen, and those of Europe. This eighth volume forms 

 a kind of supplement to the two preceding volumes, inasmuch as in it are 

 figured and enumerated all the plants which have been found since their 

 publication, in the formations of the Mesozoic and Cenozoic periods of 

 North America, and therefore forms a broad basis in vegetable paleon- 

 tology for the direction of future researches and the classification and 

 determination of the fossil flora of the Continent. The three volumes of 

 this series, on vegetable paleontology, form a grand monument to the 

 industry and fame of the author. 



I take pleasure in acknowledging my obligations to the Director of the 

 U. S. Geological Survey, who has with great kindness superintended the 

 printing of this Report. 



The plates were engraved by the well-known firm of Thomas Sinclair 

 & Son, of Philadelphia, and are fine examples of their work. 



I have the honor to remain, with great respect, your obedient servant, 



F. V. HAYDEN, 



United States Geologist. 

 To the Honorable the Secretary of the Interior. 



