70 PROCEEDINGS OF THE WASHINGTON MEETING 



ELECTION OF OFFICERS 



Ballot for officers for the ensuing year resulted as follows : A. C. Law- 

 son, Chairman; George D. Louderback, Secretary; W. S. Tangier Smith, 

 Councillor. 



REPRESENTATION ON THE COUNCIL 



The Secretary read a communication from the General Secretary con- 

 cerning the proposed representation of the Cordilleran Section in the 

 Council of the Society, in particular raising certain objections to the plan 

 proposed by the Section, and asking for a more definite statement of the 

 Section's attitude and Avishes in the matter. After considerable discus- 

 sion, the Section, by unanimous vote, instructed the Executive Committee 

 to formulate the opinion of the Section and communicate the same to the 

 Secretary and Council of the Society and to take all necessary action 

 regarding the same. 



At 3 p. m. the Section took up its scientific program and the following 

 papers were presented in the order given : 



NEOCOLEMANITE, A VARIETY OF COLEMANITE, AND HOWLITE FROM LANG, 

 LOS ANGELES COUNTY, CALIFORNIA 



BY ARTHUR S. EAKLE 



A calcium borate occurs near Lang which differs somewhat from eolemaiiite 

 in its crystallographic and optic properties and the name neocolemanite is pro- 

 posed to distinguish the variety. The deposit consists of alternate layers of 

 crystallized borate and carbonaceous shales and has apparently been formed 

 by the action of boracic acid on a lake or niarsh deposit of calc-tufa or marl. 

 The crystal forms and optical properties are described in detail. The silico- 

 borate of lime, howlite, occurs with tlie neocolemanite as snow-white, nodular 

 compact masses. It has been formed at the same time as the neocolemanite by 

 precipitations from solutions containing soluble silica. The deposit is remark- 

 able as a pure borate deposit unaccompanied by other calcium minerals or by 

 sodium salts. 



Manuscript prepared^ but paper presented without reference to manu- 

 script. This paper is published in the University of California, Publica- 

 tions of the Bulletin, Department of Geology, volume 6, June, 1911. 



MINERAL ASSOCIATIONS AT TONOPAH, NEVADA 

 BY ARTHUR S. EAKLE 



(Abstract) 



The gold-silver deposits at Tonopah present a very Instructive example of 

 mineral associations and secondarv formations of minerals in dei>osits situated 

 in arid regions where clilorides and sulphides occur. Over forty mineral spe- 

 cies occur, some of which are quite rare. The minerals are described In detail. 



