ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. Each 

 of the scientific bureaus in Washington has a representative authorized to for- 

 ward such material to this journal and abstracts of officia' publications should 

 be transmitted through the representative of the bureau in which they originate. 

 The abstracts should conform in length and general style to those appearing in 

 this issue. 



MINERALOGY. — Mineralogical notes. Series 2. Waldemar T. Schal- 

 •ler. Bulletin U. S. Geological Survey, No. 509. 1912. Pp. 115, 

 plate and sections. 

 The papers included in this bulletin are as follows: A study of the 

 rutile group; Barbierite, monoclinic soda feldspar; Crystallized turquoise 

 from Virginia; Crystallized variscite from Utah; Hinsdalite from Colorado; 

 The alunite-beudantite group; Some minerals from Beaver County, Utah; 

 Note on minerals from gabbro of Waimea Canyon, Hawaii; Cuprodes- 

 cloizite from California; Mineralogy of the French phosphorites; The prob- 

 able identity of podolite with dahlite; The composition of the phosphorite 

 minerals; Natramblygonite from Colorado; The properties of mosesite; 

 Thaumasite from Beaver County, Utah; The identity of stelznerite with 

 antlerite. W. T. S. 



GEOLOGY. — Headwater regions of Gulkana and Susitna rivers, Alaska, 

 with accounts of the Valdez Creek and Chistochina placer districts. 

 F. H. Moffit. Bulletin U. S. Geological Survey No. 498. Pp. 

 82, with maps, views, and sections. 

 The headwater regions of the Gulkana and Susitna rivers include a 

 high mountainous belt on the north, constituting a part of the Alaska 

 Range and the northern margin of the Copper River basin. Between 

 the provinces is a belt of low foot-hills rising above the plateau level, 

 and paralleling the main range. Except in the high mountains, the 

 rivers occupy broad alluvium-filled valleys. The region has been in- 

 tensely glaciated in recent times, and the remnants of the former ice 

 sheet are found in the several large glaciers found in the high range on 

 the north. 



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