TITLES AXD ABSTRACTS OF PAPERS 115 



MAGNE8ITE INDUSTRY 

 BY R. W. STONE 



(Ahstt^act) 



Magnesite and its derived products are used in a varietj* of industries, the 

 most essential of which is metallurgy. In the form of brick and grains, it has 

 its greatest application as lining of open-hearth steel furnaces and other fur- 

 naces for refining metal. A considerable quantity of calcined magnesite is 

 used in the manufacture of cement for exterior and interior plasters and for 

 flooring. 



Magnesite occurs both massive and crystalline, as veins and beds. The mas- 

 sive California variety occurring in veins is derived from the alteration of ser- 

 pentine ; the crystalline Washington variety results from the replacement oi 

 calcareous sedimentary rocks by magnesium-bearing solutions. 



Magnesite is widely distributed throughout the world. Formerly Austria- 

 Hungary and Greece supplied most of the American demand. Newly discov- 

 ered deposits in Washington and greatly increased output in California, to- 

 gether with imports from Quebec, supplied the domestic need during the war. 

 The manufacture of synthetic grain magnesite and of sintered dolomite and 

 slag east of Chicago for refractory purposes, giving an advantage of several 

 dollars in freight rates over magnesite from our only producing States, Cali- 

 fornia and Washington, raises a question as to the permanence of the domestic 

 magnesite industry at its present scale. Domestic material can not compete on 

 the Atlantic coast with foreign magnesite at pre-war prices. 



Presented in abstract from notes. 



CERTAIN ASPECTS OF GLACIATION IN ALASKA 

 BY WARREN O. CROSBY 



{Abstract) 



The paper describes and discusses examples, believed to be typical, which 

 tend to localize glacial overdeepening, and to show that valley broadening is 

 by far the more important phase. 



Presented by title in the absence of the author. 



PAPERS TRANSFERRED TO PALEONTOLOGICAL SOCIETY 



The following papers on stratigraphic and paleontologic geology were 

 offered in regular course to the Geological Society, but were transferred 

 to the Paleontological Society for reading on account of the crowded con- 

 dition of the program : 



Harold L. Alling (introduced by H, L. Fairchild) : Some problems of the 

 Adirondack Precambrian. 



Hervey W. Shimer: Permo-Triassic of northwestern Arizona. 



George E. Dorsey (introduced by E. W. Berry) : The stratigraphy and struc- 

 ture of the Newark system in Maryland and its relation to the Newark 

 system of eastern North America. 



George H. Chadwick : Remarkable persistence of thin horizons. 



