Ferguson and Merwin — The Ternary System, l^'- 1 



In addition to the results just mentioned, which suffice 

 to clear up the liquidus relations in question, as thorough 

 an investigation as the nature of the problem and the 

 available methods of attack would permit was carried 

 out upon the solid solutions of silica and 3Ca0.2Si0 2 in 

 calcium metasilicate and upon the inversion and decom- 

 position temperatures of all the various solid solutions. 



A general discussion of these results with diagrams 

 and models is given. The formation of unstable phases 

 in silicate melts is also discussed, and the futility of 

 attempting to use formulae derived from the theory of 

 dilute solutions in order to calculate the change of inver- 

 sion temperature with solid solution is briefly mentioned. 



Geophysical Laboratory, 



Carnegie Institution of Washington, 

 June 1, 1919. 



Aet. XII. — The Extent and Interpretation of the Hog- 

 shooter Gas Sand; 1 by Walter. R. Beegee. 



The Hogshooter gas sand is the producing horizon of 

 the field of the same name. This field is about twelve 

 miles in length, and from one to one and one-half miles 

 in width, extending north from the west-central part of 

 Township 24 North, Range 14 East, Washington County, 

 Oklahoma. 



The Hogshooter gas sand lies directly upon the Boone 

 Formation, which is a cherty limestone of Mississippian 

 age, underlying this region at a depth ranging from 1200 

 to 1400 feet. The sediments immediately above this sand 

 in this locality, the Cherokee shale, are considered Penn- 

 sylvanian age. The sand varies greatly in thickness and 

 pinches out at only a short distance to the east and west 

 of the long axis of the field. The greatest thicknesses 

 recorded in well records are near the center of the pro- 

 ductive area. The maximum thickness recorded is 168 

 feet in well number 3 on the Taylor allotment in Section 

 18,'Township 24 North, Range 14 East. 



The sand horizon has been determined by means of 

 several hundred records of wells drilled in this region, to 



1 Published by permission of Mr. Everett Carpenter, Chief Geologist, 

 Empire Gas & Fuel Co. 



