PEALE.J GEOLOGY — FORT UNION OR GREAT LTGNITIC GROUP. 141 

 Fort Uriion or Great Lignite group. 



Locality. 



At Fort tTnion, Fort 

 Clark, and under 

 the White Eiver 

 beds, on the North 

 Fork of the Platte 

 Eiver, above Fort 

 Laramie, and west 

 <# "Wind Eiver 

 Mountains. 



Upper Missouri re- 

 gion. 



Extension into Brit- 

 ish America. 



Porcupine Creek, 

 Missouri Coteau, 

 '^^est Souris Eiver, 

 and other parts of 

 British America. 



Milk Eiver 



Tongue River 



Eastern base of Black 

 Hills. 



Grand Eiver, "N'e- 

 braaka, (now Da- 

 kota.) 



Lignite of Long 

 Lake, Kebra-ska, 

 (now Dakota.) 



Litmite of Big Horn 

 Mountains, and at 

 month of Big Horn 

 Eiver. 



Beds beneath White 

 Eiver beds, south 

 of FortFetterman. 



Korth Platte Eiver 

 and La Pr61e Creek. 



Descriptiou of strata. 



Beds of clay and 

 sand, with round 

 terragiuous con- 

 cretions and nu- 

 merous beds and 

 Seams and local 

 deposits of lignite. 



Age. 



Eocene Tertiarv . 



Tertiary . 



Miocene Tertiary 

 Lower Tertiary . . . 

 Lower Tertiary.., 



Miocene 



Tertiary 



Cretaceous 



Miocene 



Tertiary 



Miocene 



Cretaceous No. 6 

 Lower Eocene . . 



Eocene 



Cretaceous 



Eocene 



Lower Eocene . . . 

 Lignitic Tertiary 



.do 

 .do 



Cretaceous. 



...do 



...do 



Lignite (Tertiary) 

 Eocene 



Authority. 



Hay den. 



Meek and Hay 

 den. 



...do 



...do 



Hay den 



Leidy 



LeConte 



Hay den 



Cope 



Newberry 



Hayden 



Newberry 



Cope 



Lesquereux. .. 

 G.M.Dawson. 

 J.J.Stevenson 



G. M. Dawson 



...do 



Hayden 



.do 

 .do 



Cope. 



.do 



.do 



Hayden. 

 ...do ... 



Eeference. 



Exploration of Tel- 

 lowstone and Mis- 

 souri Elvers, under 

 Capt. W. F. Eay- 

 nolds, 1859-'66; 

 Geol. Eeport of F. 

 V. Hayden, p. 29. 



Proceedings Acad. 

 Nat. Sci., Philadel- 

 phia, 1856, p. 63. 



Do., p. 225. 



Do., p. 113. 



Transactions Amer. 

 Philosophical Soc, 

 1860. 



Do. 



Exploration of Smoky 

 Hill Eailroad route, 

 1868, p. 65. 



American Journal of 

 Sciences and Arts, 

 1868, p. 204. 



Transactions Ameri- 

 can Philosophical 

 Soc, 1869. 



AnnaM Lyceum Nat. 

 History of city of 

 New York, vol. is, 

 1868. 



EeportlJ.S. Geol. Sur- 

 vey of Ter., 1867- 

 '68-'69, p. 57. 



EeportU. S. Geol. Sur- 

 vey of Ter., lc<70, 

 pp. 95, 96. 



Eeport United States 

 (j-eol. Survey, 1873, 

 p. 433. 



Eeport D. S. Geol. 

 Survey, 1872, piJ, 

 410-417. 



Canadian Naturalist, 

 vol. vii, April, 1874, 

 p. 252. 



" The Geological Rela- 

 tions of the Lignitic 

 Groups," read be- 

 fore the American 

 Pbilosop. Soc , June 

 18, 1875. 



Eeport of British 

 American Boundary 

 Survey of Forty- 

 ninth Parallel, pjo. 

 6, 8, 18, 19, 86, 93, 97, 

 103, 152. 



Do., p. 186. 



EeportD.S Geof. Sur- 

 vey of Ter., 1867- 

 '68-'69, p. 72. 



Do., p. 73. 



Do., p. 73. 



EeportlJ.S. Geol. Sur- 

 vey of Ter., 1873, 

 p. 446. 



Do.,pp. 453-'4. 



Do., pp. 453-'4. 



Eeport U.S. Geol. Sur- 

 vev of Ter., 1870, 

 p. 16. 



Do., p. 22. 



