PROCEEDINGS OF THE ACADEMY AND AFFILIATED 



SOCIETIES 



THE GEOLOGICAL SOCIETY OF WASHINGTON 

 The 282d meeting was held at the Cosmos Club, March 25, 1914. 



INFORMAL COMMUNICATIONS 



Reactions of nickel arsenides with silver salts: Chase Palmer. 



An occurrence of chrysotile asbestos at Ash Creek, 35 miles northeast 

 of Globe, Arizona: J. S. Diller. 



Concave exfoliation: F. E. Matthes. Concave exfoliation in mas- 

 sive granite under the bed of Yosemite Creek, in the Sierra Nevada, 

 was described as an illustration of the diversity of form which shells 

 resulting from superficial exfoliation vas^y exhibit. Such shells, far 

 from being always spherical may be plane, or even concave, according 

 to the configuration of the surface upon which they develop. 



Radial barite concretions from the Cretaceous of southeastern Montana: 



C. A. BONINE. 



REGULAR PROGRAM 



Stratigraphy of the Red Beds in New Mexico (illustrated): N. H, 

 Darton. In this communication there was presented an outline of the 

 results of study of the central and western parts of the Red Beds area 

 in New Mexico during the past summer. The investigation was pri- 

 marily a search for evidence which might lead to the discovery of potash 

 deposits in the Red Beds, and this part of the work is not yet finished. 

 Close attention was given to the stratigraphy, especially as to relations 

 and succession of gypsum deposits and other desiccation products, with 

 a view to determining areas in which chemical deposition had continued 

 longest. Much new light was obtained on the relations and develop- 

 ment of a great series of alternating limestones and gypsum deposits, 

 the San Andreas limestone of Lee, which separates a thick lower forma- 

 tion of red beds from an upper formation of red beds in a wde area in 

 central New Mexico. Some attention was given to the separation of 

 the Triassic portion of the Red Beds in part of the area. Evidence was 

 obtained as to the possible extension of Jurassic rocks into the region, 

 and the probable Morrison formation was traced far to the south and 

 southwest in New Mexico. 



Moraine Dome and the moraines of the Little Yosemite Valley (illus- 

 trated) : F. E. Matthes. Moraine Dome is a low granite dome on the 

 north side of the Little Yosemite Valley, in California, of interest chiefly 

 for the moraines and other glacial features associated with it. The 

 ice of the last glacial epoch, when at its highest, split upon the north- 

 east end of the dome and pushed a short lobe through the saddle to the 

 north, as is shown by the successive moraines doubling around the 

 eminence. 



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