proceedings: geological society 99 



INFORMAL COMMUNICATIONS 



H. yi. Ami: Notes on the geology of Asia Minor. The general geolo- 

 gic features were outlined with special reference to large undeveloped 

 mineral resources. 



REGULAR PROGRAM 



Willis T. Lee : Geology and scenery of the Rocky Mountain National 

 Park. 



E. 0. Ulrich: The limitations of fossils in correlation. 



T. Wayland Vaughan: Summai'y of 7'esults of study of marine 

 bottom samples from Murray Island, Australia, the Bahamas, and 

 Florida. 



The 322d meeting was held at the Cosmos Club, November 28, 1917. 



INFORMAL communications 



B. S. Johnson: Chalmersite, CuFciS^, a new ore of copper. This 

 mineral occurs extensively in greenstone in several localities in Alaska. 

 It is associated with pyrrhotite and chalcopyrite. A satiny sheen due 

 to cleavage is one of its distinguishing characteristics. 



R. C. Wells: Tungstenite, disulphide of tungsten, a new mineral. 

 The disulphide of tungsten, WS2, was found in material from the Emma 

 mine, Little Cottonwood district, Utah, associated with pyrite, tetra- 

 hedrite, and galena. The mineral resembles graphite and shows slicken- 

 sided surfaces but has a specific gravity of about 7.4. It is decomposed 

 by aqua regia or by fusion with niter. It occurs massive, is dull to 

 brilliant metallic in luster, is gray in color, and its hardness is about 2.5. 



R. W. Stone: The developmeyii of valuable magnesite deposits in the 

 State of Washington. This material is suitable for replacing imported 

 magnesite for use in paper-making and for refractories. The signifi- 

 cance of previously reported analyses of this material was not appre- 

 ciated, and its rediscovery and recognition as a commercially valuable 

 substance was purely accidental. 



REGULAR program 



Eugene Wesley Shaw: The "lakes" of northeastern Arkansas, and 

 some features of the work of the Mississippi River. Northeastern Arkansas 

 has, according to all maps of the region, numerous large and small 

 lakes. As a matter of fact most of these lakes are fictitious and many 

 are not even swamps. The "lakes" are generally believed to" have 

 been caused by the New Madrid earthquake of 1811-12 and are widely 

 known as "sunk lands." However, in most of them the surface has 

 not been depressed ; they do not have a basin form bilt instead are as 

 high as surrounding country. All are in the heavily forested bottom 

 lands of the lower Mississippi. In this forest there are natural openings 

 that are swampy and some of them have shallow temporary or perma- 



