502 



REPOKT OF NATIONAL MUSEUM, 1904. 



Hunt, coming to Hall's assistance, argued that bis views were largely 

 in harmony with those previously maintained by masters in the 

 science of geology, de Montlosier, as early as L832, having declared 

 that the great mountain chains of Europe were but the remains of 

 continental elevations which had been cut away by denudation, the 

 foldings and inversions in the structure of mountains being looked 

 upon as local and accidental. 



Joseph Le Conte, in a later paper, was inclined to criticise Hall's 

 theory as insufficient, but a statement of his views, as well as those of 

 Dana, may be left to their proper place in chronological succession. 



In L859 Henry Engelmann accompanied, 

 as geologist, an expedition commanded by 

 (apt. J. II. Simpson, organized for the 

 purpose of opening new wagon routes for 

 military purposes across the Great Basin 

 of Utah. Engelmann's report, accom- 

 panied by one of Meek's on 

 PnTta m hTs5Q W ° rk the invertebrate fossils, 

 formed Appendixes I and 

 K of the general report of the expedition. 

 Originally, as it would appear from the 

 text, the manuscript was accompanied by a 

 geological map and profile, though such do 

 not seem to have been published. No 

 explanation is offered, but it is probable 

 that developments during the long interval up to time of publica- 

 tion" were such as to make the map of doubtful value, and it 

 was suppressed. Engelmann's observations began with the country 

 in the immediate vicinity of Leavenworth. He noted the presence of 

 rocks of Carboniferous and Permo-Carboniferous ages along the 

 Republican River, and of Cretaceous and Tertiary deposits farther 

 west. In the district leading from the eastern foothills of the Rocky 

 Mountains to the divide between the waters of the Atlantic and Pacific 

 he thought to recognize rocks of Silurian and probably Devonian, Car- 

 boniferous, Permian, Triassic, Jurassic, Cretaceous, and Tertiary ages. 



Fig. 72.— Henry Engelmann. 



« Owing t<> tin- outbreak of the civil war, the publication of the report was delayed 

 until 1876. 



