156 Scientific Intelligence. 



been published by the same author. Geology of Silver Clif and 

 the Bosita Sills, Colorado, by Whitman Cross, pages 160, plates 

 11, and The Mines of Custer County, Colorado, by S. F. Em- 

 mons, pages 67, plate 1, refer to the same region. The observa- 

 tions for these papers were made chiefly in 1883. The rapid de- 

 cline of the district as a mining camp has greatly increased the 

 difficulty of obtaining satisfactory data. Geologic Section Along 

 the New and Kanawha Rivers in West Virginia, by M. R. 

 Campbell and W. C. Mendenhall, pages 38, plates 12. The len- 

 nessee Phosphates, by C. W. Hayes, pages 38, plates 6. There 

 are three papers on hydrography. Those by Gilbert and Leverett 

 have already been mentioned.* The final paper is & Preliminary 

 Report of the Artesian Waters of a Portion of the Dakotas, by 

 N. H. Darton, pages 93, plates 39. 



The following monographs have been issued: — Monograph 

 XXVIII, Geology of the Denver Basin in Colorado, by S. F. 

 Emmons, Whitman Cross, and G. H. Eldridge, pages 556, plates 

 33, four of which are maps on a scale Tg^VoT? showing the topog- 

 raphy, areal, economic and structural geology. The geology, 

 excepting that of the Denver formation, is chiefly by Emmons 

 and Eldridge. The Denver formation and the petrography are 

 by Mr. Cross. 



Chapter VII on Paleontology was contributed by Mr. F. H. 

 Knowlton and Prof. O. C. Marsh. 



Monograph XXVIII, The Marquette Iron-bearing District of 

 Michigan, by C. R. Van Hise and W. S. Bayley, with a Chapter 

 on the Republican Trough by H. L. Smyth, pages 608, plates 36, 

 and atlas of 39 maps. The geology is chiefly by Van Hise and 

 the petrography by Bayley. The volume is most handsomely 

 illustrated. 



The following bulletins have been issued : — 



No. 137, The Geology of the Fort Riley Military Reservation 

 and Vicinity, Kansas, by Robert Hay, has 35 pages. 



No. 139, Geology of the Castle Mountain Mining District, 

 Montana, by W. H. Weed and L. V. Pirsson, contains 164 pages. 

 A geological map, based on the topography as outlined by the 

 Transcontinental survey, shows the distribution of a large number 

 of rocks from the Algonkian to the Miocene inclusive with a full 

 series of acid and basic eruptives. 



No. 141, The Eocene Deposits of the Middle Atlantic Slope 

 in Delaware, Maryland and Virginia, by W. B. Clark, has 166 

 pages, and 40 plates. The geological and paleontological data, 

 including a considerable number of new species, are fully illus- 

 trated and discussed, and Prof. Clark is decidedly of the opinion 

 that the Eocene deposits of the Middle Atlantic slope represent 

 the greater portion of the Eocene series of the Gulf, its upper 

 members alone excepted. 



No. 143, Bibliography of Clays and the Ceramic Arts, by J. 

 C. Branner, has 114 pages. 



*This Journal, February, 1897, p. 154. 



