225 



from tlie reports and maps of Pope/ Whipple,'- and Marcy ;^ the valley 

 of the Canadian, from Whipple;^ that of the Arkansas, from Emory,* 

 Gunnison,^ and the Arkansas Valley Kailroad ; the Kansas Eiver and 

 Smoky Hill Fork, from the Kansas Pacific Eailroad ; the Valley of the 

 Republican, from Fremont^ and Stansbury;'^ that of the Platte, from 

 the Union Pacific Eailroad. Information concerning the Missouri Eiver 

 and the country lying between that river and the Black Hills is derived 

 from the work of Warren,^ Eaynolds,^ and Ludlow.'" Stevens ^^ gives 

 much information concerning the country east of the Missouri, and the 

 Islorthern Pacific Eailroad furnishes a i)rotile across it. Facts and fig- 

 ures concerning the plains of the Upper Missouri come mainly from 

 Stevens." 



The divides between the valleys have been crossed in many places, 

 and profiles made, and in no place do they show much rise above the 

 valleys. 



The principal authorities consulted in regard to the Black Hills are 

 the reports of Warren,^ Eaynolds,^ Ludlow,'" and Jeuney's map.'^ 



Proceeding westward and entering the mountains, isolated elevations 

 become of less value, while a knowledge of the general topographic 

 features correspondingly increases in value. 



For a knowledge of the topographic features of New Mexico, I have 

 consulted the reports of the United States expeditions which have 

 crossed that Territory; i)rincipal among them are Emory,* Whipple,^ 

 Ives,^^ Parke,'* and Simpson.'^ The mountain and plateau regions of 

 Colorado are from the work, published and unpublished, of this Survey. 

 The plateau country adjacent to the Green and Colorado Elvers is from 

 the published, and, through the courtesy of the geologistin-charge, the 

 unpublished, work of the survey in charge of Maj. J. U\ Powell."^ The 

 country of the Lower Colorado is known from Ives's'" report, and the 



1 Pacific Railroad Eeports, vol. ii. 



* Pacific Eailroad Reports, vol. iii and iv. 



3 Exploration of Red River of Louisiana. Thirty -second Congress, second session, 

 Executive Document No. 54. 



■♦Xotes of a Military Reconnaissance from Fort Leavenworth, Mo., to San Diego, Cal., 

 by Maj. W. H.. Emory, 1846-'47. Thirtieth Congress, first session. Executive Docu- 

 ment No. 7. 



^Pacific Railroad Report, vol. ii. 



^ Report of the Exploring Expedition to the Rocky Mountains in the year 1842, and 

 to Oregon and North Calitornia in the years 1843-'44, by Brevet Capt. J. C. Fremont. 



^ Exploration and Survey of the Valley of the Great Salt Lake of Utah. Howard 

 Stausbury. Special session, 1851, Senate Executive Document No. 3. 



''Reconnaissance of the Dakota Country, 1855. Thiity-fourth Congress, first ses- 

 sion. Senate Executive Document No. 76. 



o Exploration of the Yellowstone River, by Brevet Brig. Gen. W. F. Raynolds, and 

 Geological Report, by Dr. F. Y. Hayden. Fortieth Congress, first session. Senate 

 Executive Document No. 77. 



"^Report of a Reconnaissance of the Black Hills of Dakota in 1874, by Capt. "William 

 Ludlow. 



"Pacific Railroad Reports, vol. i and Supplement, and vol. xii, part i. 



'^ Map of the Black Hills, \Y. P. Jauuey, 1875. 



'■" Report upon the Colorado River of the ^Vest, explored in 1857 and 1858, by Lieut. 

 J. C. Ives. Thirty-sixth Congress, first session, Senate Executive Document. 



^* Pacific Railroad Report, vol. vii. 



'■'' Report of an Expedition into the Navajo Country, by Lieut. J. H. Simpson, 1849. 

 Thirty-first Congress, first session, Senate Executive Document No. C4. 



I'' Exploratiou of the Colorado River of the \Yest, in 18tJ9-'72, by J. W. Powell. 



'" Report upon the Colorado) River of the \Yest, explored iu 1857 and 1858, by Lieut. 

 J. C. Iv( s. Thirty-sixth Congress, first session, Senate Executive Document. 



