150 



GEOLOGICAL SURVEY OF THE TERRITORIES. 

 White River group. 



Locality. 



Description of strata. 



Age. 



Authority. 



Reference. 



On White River, un- 

 der Loupe Eiver 

 beds, and on the 

 Niobrara River, 

 and across to tbe 

 Platte River. 



On White Earth 



Wliite and light-drab 

 clays with some 

 beds of sandstone, 

 and local layers of 

 limestone, and 

 whitish indurated 

 clays. 



Variegated beds, 

 cream-colored, rod- 

 dish-brown, and 

 light-gray sands 

 and marls. 



Light-colored marls 

 and sands. 



Miocene 



....do 



Hayden 



do. . 



Geol. Report of Ex- 

 ploration of Yellow- 

 stone and Missouri 

 Rivers, by Dr. F. V. 

 Hayden, under 

 Capt. W. P. Rav- 

 uolds, 1859-'60, p.2'9; 

 also Report U. S. 

 Geol. Survey, 1867- 

 '68-'69, p. 57. 



E.'cploration of Yel- 

 lowstone and Mis- 

 souri Rivers, p. 134. 



Report TJ. S. Geol. 



Survey, 1867-'68-'69, 

 p. 80. 



Do., p. 110. 



Report of IJ. S. Geol. 



Survey, 1870, pp. 13, 



15. 

 Do., pp. 19, 20, 23. 



Do., pp. 23, 24. 

 Do., p. 121. 



Report IT. S. Geol. 



Survey, 1871, p. 353. 

 Report' U. S. Geol. 



Survey, 1873, p. 17. 



Do., p. 401. 



Creek and White 

 River. 



In the valley of the 



White River Ter- 

 tiary. 



....do 



....do 



C h u g- Water, o n 

 Horse Creek, and 

 on the North Platte. 



Beds beneath Chey- 

 enne. 



On the Chug-Water 

 and Crow Creek. 



....do 





. do 



....do 





....do 



....do 



on La Bonte and 

 Horseshoe Creeks. 





....do 



....do 







do 



. ..do 



of Fort Laramie. 



Drab, yellow, and 

 light-g'ray s a n d - 

 stones, marls, and 

 clays. 







Plains west of Chey- 

 enne. 



Miocene (!) 



Miocene 



Hayden 







The "Mouument Creek" and the "Gallisteo Sand" groops deserve 

 mention here. The latter has been referred to the Miocene by Dv. 

 Hayden (Report U. S. Geol. Survey, 1867-'68-'69, pp. 139, 1(57, 190.) It 

 consists of " variegated sands and sandstones, and light-reddish brick- 

 red, purplish, yellow-white, brown, and drab, with irregular layers of 

 dull rusty-brown concretionary arenaceous limestones." It will be noticed 

 that this description resembles those already given for the Green River 

 and Wahsatch groups. 



In the report of U. S. Geol. Survey, 1867-'68-'G9, p. 139, 140, Dr. Hay- 

 den points out the resemblance of the Monument Creek group to the 

 Gallisteo Sand group, and to the beds between Fort Bridger to Weber 

 Caiion (Wahsatch group), and refers it to Late Miocene or Pliocene, 

 He makes the same reference in the report for 1870, p. IGl. In the 

 report for 1873, page 33, he refers it to Miocene. In Bulletin No. 3, 

 Second series, he refers it to the Lignitic group, but in Bulletin No. 4, p. 

 219, he corrects this statement. Prof. E. D. Cope (Eeporfc U. S. Geol. 

 Survey 1873, p. 430) says: "The age of the Monument Creek formation 

 in relation to the other Tertiaries not having been definitely determined, 

 I sought for vertebrate fossils. The most characteristic one which I 

 procured was the hind leg and foot of an Artiodaetyle of the Oredore 

 type, which indicated conclusively that the formation is newer than the 

 Eocene. From the same neighborhood and stratum, as I have every 

 reason for believing, the fragment of the Megaeeratops color adoensis was 

 obtained. This fossil is equally conclusive against the Pliocene age of 

 the formation, so that it may be referred to the Miocene, until further 

 discoveries enable us to be more exact." 



The columns on the opposite page are summarized from the tables that 

 have already been given : 



