886 HISTORICAL GEOLOGY. 



1. Deep River beds, the Cyclopidius beds of Scott, in the Deep 

 River (or Deep Creek) region, which are overhxid by beds with 

 Loup Fork fossils. Ticholeptus beds of Cope, but not those so 

 named of Wyoming and Oregon. 



2. Middle Miocene. Miohippus beds and Johjt Day beds of Marsh 

 (1877), occurring on John Day River, Oregon. 



1. Lower Miocene. Wliite River beds of Hayden (1857) ; Oligocene 

 of Scott. 



3. Protoceras beds of Wortman, of the White River region. 



2. Oreodon beds of Marsh (1877), in the White River basin. 



1. Tltanotherium beds of Hayden (1857, 1869), in the White 

 River region on the Niobrara, and in Dakota and Colorado. Bronto- 

 therium beds of Marsh. 



1. Eocene period. 



3. Upper Eocene. 



4. Uinta group of Marsh (1871), and of King (1878), lying to 

 the south of the Uinta Mountains in Utah (U on the map, page 881). 

 Diplacodon beds of Marsh (1877) ; includes the Brown's Park group 

 of Powell (1876). The Florissant group of South Park, Col. 

 The Amyzon beds of Elko and Osino, Nev., are referred to the 

 top of the Uinta or base of the Miocene. 



2. Middle Eocene. 



3. Bridger group of Hayden (1869), named from Fort Bridger, 

 Wyoming, represented to the north of the Uinta Mountains over- 

 lying the Wasatch beds. Dinoceras beds of Marsh. Green River 

 group of Hayden (1869) is included ; probably also the Washakie 

 group of King (1878). The Wind River group of Hayden (1861) 

 has been referred to the bottom of the Bridger by Scott and Osborn, 

 and made the equivalent of the Green River group ; but to the top 

 of the Wasatch by Cope. 



1. Lower Eocene. 



2. Wasatch group of Hayden (1870), covering parts of Utah, 

 Wyoming, and Colorado. Goryphodon beds of Marsh. Vermilion 

 group of King. Bitter Greek group of Powell. 



1. Puerco group of Cope (1875), named from Puerco River, New 

 Mexico, occupying a basin extending from northern New Mexico 

 into southern Colorado (P, map). Lower Wasatch of Marsh. 



ROCKS — KINDS AND DISTRIBUTION. 



The beds, especially the marine, commonly vary much in character 

 from mile to mile. Instead of great strata of almost continental extent and 

 uniformity, as in the Silurian, there is the diversity which exists among 

 the modern formations of the seacoast. But yet such diversity is not 



