Chapter XVI. 



EARLIER TERTIARY (EOCENE AND OLIGOCENE). 



Color, orange and light orange, in ruling and dots, and orange brown. 



Symbol, 5, 5a, 5b, 5bl, 5c, 5d. 



Distribution: Throughout the Atlantic and Gulf Coastal Plain, Mississippi embayment, Central 

 America, the West Indies, Jamaica, Colombia, and along the Pacific coast to Alaska; also 

 in the interior western United States and Canada and in Greenland. 



Content: Marine Eocene and Oligocene of Central America, the West Indies, and Pacific coast 

 to Alaska (5), including the coal-bearing formations of Puget Sound (Puget group) and 

 Alaska (Kenai formation) ; marine Eocene and Oligocene of the Atlantic and Gulf coast 

 plains, the Mississippi embayment, Jamaica, and Greenland (5b and 5d) ;■ continental 

 Eocene (Puerco, Fort Union, Wasatch, Green River^ Bridger, and Uinta formations) of 

 the Interior (5bl); continental Oligocene (White River group, including Chadron and 

 Brule formations) of the Great Plains (5c) ; earliest Tertiary or latest Cretaceous of the 

 Interior (Shoshone group, Denver and Arapahoe and equivalents in Colorado; "Upper 

 Laramie," Lance formation, and "Ceratops beds" or "Somber beds," in Wyoming, Mon- 

 tana, and the Dakotas), Edmonton of Alberta, "Upper Laramie" of Canadian reports, 

 and in Colombia the Guaduas or Cerro de Oro formation (5a) . 



Earlier Tertiary areas. 



Page. 



B]8 Colombia 708 



B-C 19 Venezuela (not mapped) 708 



C 16 Nicaragua 709 



C 17 Panama (not mapped) 711 



C 20 Trinidad (not mapped) 714 



E 17-18 Jamaica 717 



E-P 15-16 Chiapas, Guatemala, Tabasco, and Yucatan 721 



P 17-18 Cuba 722 



G-H 14, H-1 15 Texas, Louisiana, and Arkansas 723 



G 17, H 16-17, 1 15-17, J 16 South Atlantic and eastern Gulf Coastal Plain and north end of Mississippi embay- 

 ment 731 



I 17-18, J 18, K 18-19 North Carolina to Massachusetts, inclusive 745 



I-J 11 \ . . . .Great Basin, Nevada and California 750 



J 10 Sacramento Valley and Coast Ranges, California 751 



J 12 - Plateau province of Utah 755 



J 12-13^ San Juan Basin, Colorado and New Mexico 755 



J 13 Great Plains of Colorado; east-central Colorado (not mapped) 757 



J-K 12-13 Uinta Valley, Roan or Book Plateau, and Grand Mesa 759 



J-K 13, L 13-14 Great Plains of Colorado, Wyoming, Montana, North and South Dakota ... 761 



K 10 Rogue River valley, Oregon 764 



K 12 Northeastern Utah and southwestern Wyoming; Wind River Basin, Wyoming. 765 



K 13 Wyoming and Colorado 766 



K 13-14 Great Plains of South Dakota, Wyoming, Colorado, and Nebraska 769 



K-L 10 Coast Range of Oregon 771 



L 10 John Day Basin, Oregon; Cascade Range and Yakima Valley, Washington 772 



L 12 Bighorn Basin, Wyoming; western Montana; Bull Mountain coal field, Montana; 



Red Lodge coal field, Montana 774 



L 13 Plains east of the Bighorn Mountains, Wyoming; Miles City coal field, Montana; 



Sentinel Butte coal field, North Dakota and Montana 777 



L-M 10 Olympic Peninsula and Puget Sound region, Washington 778 



M 10 Southern British Columbia (not mapped) 780 



M-N 11-12 Great Plains, Alberta 781 



706 



