GEOGRAPHY. 333 



the Pacific coast. The old glaciated rocks and morainal de- 

 posits were found on a remarkably grand scale in both the 

 Wind River and Teton ranges. 



The numerous lakes have been the beds of srlaciers, and 

 their shores are walled with morainal ridges. 



All of these interesting features were carefully studied, 

 and the results will be elaborated for the twelfth annual re- 

 port of the Survey. 



The atlas of Colorado, in twenty sheets, has been recently 

 published from the labors of this survey. This atlas con- 

 sists of two series of maps, the one of a general, the other 

 of a detailed kind. The first series, on the scale of twelve 

 miles to one inch, comprises four sheets, each embracing 

 the whole State of Colorado and part of the neighboring 

 territory. The first of these illustrates the system of tri- 

 angulation adopted in the survey ; the second shows the 

 drainage -system of the area; the third, by a simple and 

 clear arrangement of colors, exhibits at a glance the econom- 

 ic features of the whole region the agricultural land, past- 

 urage, forests and woodlands, sage and bad lands, mineral 

 tracts, and the portions rising above the limit of timber- 

 growth ; and the fourth contains a condensed and general- 

 ized geological map of the same territory. The second se- 

 ries consists of six topographical and six geological maps. 

 In the topographical maps the configuration of the surface 

 is plainly shown by means of contour- lines of 200 feet of 

 vertical distance. The geological maps are identical sheets 

 with the topographical maps, the geological features being 

 represented in colors glacier moraines, lake-deposits, drifts, 

 sand-dunes, and recent alluvia all finding adequate expres- 

 sion. Two sheets of geological sections, and two large sheets 

 of sketches complete the atlas. 



Under the direction of Major J. W. Powell, the labors of 

 the United States Geographical and Geological Survey of the 

 Rocky Mountain Region have been continued during the past 

 year. From the return of the field-parties in the autumn of 

 1877, till July, 1878, the entire corps remained in Washing- 

 ton preparing the results of the field-work for publication. 

 In July, 1878, a division was sent to the field, but a force was 

 also retained at Washington to continue the ethnographic 

 work, and to complete and edit certain unfinished reports. 



