244 



SCIENCE. 



[N. S. Vol XII. No. 294. 



the Appalachian Valley and Allegheny 

 ranges no field work is now in progress ex- 

 cept incidentally to the investigation of the 

 Coal Measures. Folios of the Geologic 

 Atlas, for which the data have been on 

 hand, have recently been advanced to pub- 

 lication. The detailed surveys of the Ap- 

 palachian coal field (Campbell and David 

 White) have, however, been pushed ener- 

 getically in "West Virginia, Kentucky, and 

 Ohio. 



In the Lake Superior region the studies 

 of the iron-bearing ranges begun under 

 Irving are approaching completion. The 

 work on the Vermillion Range, Minnesota 

 (Van Hise and others) is nearly accom- 

 plished, and the Mesabi district alone re- 

 mains to be surveyed. The results of the 

 survey of the Menominee district are pub- 

 lished as a folio of the Geologic Atlas. 



The long continued investigation of the 

 glaciated region is now bearing fruit in a 

 series of monographs by Mr. Leverett, one 

 of them having been published, another 

 being ready for the printer, and the work 

 on others being planned. 



The geology of Indian Territory is being 

 studied in prosecution of surveys having 

 for their initial purpose the determination 

 of the stratigraphy and structure of the 

 coal field. Three folios of the Geological 

 Atlas have been prepared (Tafi'), and data 

 for others are accumulating. 



The Black Hills has long been a center of 

 much geologic interest. Detailed strati- 

 graphic surveys of the Paleozoic and Mes- 

 ozoic formations around all but the northern 

 portion of the Hills have been very success- 

 fully and carefully carried out (Darton), 

 and there has resulted a report to be pub- 

 lished in the twenty-first Annual, in which 

 the facts of stratigraphy and structure are 

 set forth with much detail and clearness. 



The detailed investigation of the Spear- 

 fish and Sturgis quadrangles in the vicinity 

 of Deadwood has resulted in an important 



contribution to our knowledge of laceolithic 

 intrusions (Jaggar), and the mining dis- 

 tricts have been carefully examined (Em- 

 mons and Iriving). 



The investigating of the Butte, Montana, 

 mining district has been facilitated by the 

 workings opened up during litigation, and 

 advantage has been taken of this fact 

 to study that interesting region exhaus- 

 tively. A survey was also made of the 

 Elkhorn district (Emmons and Weed). In 

 connection with the examination of the 

 copper deposits in general, those of the Ap- 

 palachian Range have also been visited. 



In the San Juan Mountains of Colorado 

 the work begun several years ago continues 

 with accuracy and energy, and in con- 

 nection with it special investigations have 

 been made of the Silverton and Rico min- 

 ing districts (Cross, Spencer, and Ransome). 

 The publication of the Telluride folio marks 

 a departure in the character of the Geologic 

 Atlas, in as much as it contains a detailed 

 record of the geologic facts (Cross, Puring- 

 ton). 



In the Great Basin province, southern 

 Nevada was traversed during a prolonged 

 reconnaissance, the purpose of which was 

 to secure data for the geologic map of the 

 United States (Spurr). 



Where the Rio Grande traverses the 

 mountain region of Texas it flows through 

 a grand canyon, from which several parties, 

 including those of the Boundary Surveys, 

 turned back after vain efforts to traverse 

 it. In the autumn of the past year this 

 canyon was successfully studied and an 

 important contribution to the geology of 

 western Texas was thus made (Hill). 



In Washington the surveys of the Cas- 

 cade Range were extended by the survey 

 of the Mount Stuart quadrangle and the 

 partial survey of the Snoqualmie quadrangle 

 and the Tacoma folio was completed and 

 published (Willis, Smith, and Mendenhall). 



In Oregon work in the Roseburg and 



