ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. 

 Each of the scientific bureaus in Washington has a representative authorized to 

 forward such material to this Journal and abstracts of official publications 

 should be transmitted through the representative of the bureau in which they 

 originate. The abstracts should conform in length and general style to those 

 appearing in this issue. * 



GEODESY. — Descriptions of triangulation stations in Georgia. C. H. 



SwiCK. U. S. Coast and Geodetic Survey Special Publication No. 



45. Pp. 43, with 1 illustration. 1917. 

 This volume is supplementary to Triangulation in Georgia, U. S. 

 Coast and Geodetic Survey Special Publication No. 43, abstracted in a 

 preceding number of this Journal (7:584. 1917), and contains all 

 available descriptions of the triangulation stations in Georgia whose 

 geographic positions are given in the previous volume. Practically all 

 of the triangulation data in Georgia, the observations for which were 

 made before 1917, are now in published form and so are readily avail- 

 able for the use of engineers, geographers, and surveyors. 



C. H. S. 



GEOLOGY. — The De Soto-Red River oil and gas field, Louisiana. 



George Charlton Matson and Oliver Baker Hopkins. U. S. 



Geological Survey Bulletin 661-C. Pp. 40, with maps, sections, 



and illustrations. 1917. 

 The De Soto-Red River oil and gas field lies in the northwestern 

 part of Louisiana. In 1912, gas was discovered in De Soto Parish 

 near Naborton at a depth of about 800 feet. Deep drilling resulted in 

 the discovery of small quantities of oil, and on May 10, 1913, the com- 

 pletion of the Gulf Refining Company's Jenkins well No. 2 proved the 

 presence of a notable oil pool. The producing oil and gas bearing 

 sands are in the Gulf series of Upper Cretaceous age. 



The shales associated with the sands and in some places the sands 

 themselves contain considerable organic matter which was apparently 

 derived chiefly from vegetation, and it is believed that the oil and gas 

 were formed from this organic matter by slow cKemical changes, which 

 may have been facilitated by moderately high temperature and the 



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