eliminating the examination of both the percentage and constituent columns of 

 the first method discussed. 



The third method of assembling data is a tabulation. A number of columns, 

 headed by the names of significant types of residues, allow space for tabulating 

 the percentage of each constituent and for symbols with superscripts or abbrevi- 

 ations added as modifying descriptions. This method is not suitable for cor- 

 relation work and cannot be used in conjunction with the standard scale of 

 plotted logs. It is useful only for tabulating data for the use of log plotters or 

 others making strip logs or for consultation when detailed information not 

 amenable to log plotting is needed. 



The first method has been found to be the most satisfactory; and it is 

 recommended, although several versions of the three have been used, and other 

 combinations may be devised. It is most desirable for all workers to use a 

 standard set of symbols, superscripts, and overprints. This applies especially to 

 new workers entering the field of insoluble residues. Workers could then ex- 

 amine, discuss, interpret, and publish insoluble-residue correlations and iden- 

 tifications with a common background. Many workers will find it difficult or 

 unwise to change systems of graphic description, because consistence with former 

 usage is necessary where logs or records are involved. 



BIBLIOGRAPHY 



Grohskopf, J. G., and McCracken, Earl, 1949, Insoluble residues of some Paleozoic for- 

 mations in Missouri, their preparation, characteristics, and application: Missouri Geol. 

 Survey, Rept. Inv. 10. 



Hendricks, Leo, 1940, Subsurface divisions of the Ellenburger in north-central Texas: 

 Texas Univ. Bur. Econ. Geology Bull. 3945, p. 923-968. 



Ireland, H. A., 1936, The use of insoluble residues for correlation in Oklahoma: Am. 

 Assoc. Petroleum Geologists Bull., v. 20, p. 1086-1121. 



, 1947, Terminology for insoluble residues: Am. Assoc. Petroleum Geologists 



Bull., v. 31, p. 1479-1490. 



__., 1956, Upper Pennsylvanian arenaceous Foraminifera from Kansas: Jour. 



Paleontology, v. 30, p. 831-864. 



McCracken, Earl, 1955, Correlations of some insoluble residue zones of upper Arbuckle 

 of Missouri and southeastern Kansas: Am. Assoc. Petroleum Geologists Bull., v. 39, p. 47-59. 



McQueen, H. S., 1931, Insoluble residues as a guide in stratigraphic studies: Missouri Geol. 

 Survey, 56th Bienn. Rept. State Geologist, Apr. 1, p. 103-131. 



Martin, H. G., 1931, Insoluble residues studies of Mississippian limestones in Indiana: 

 Indiana Dept. Cons. Pub. 101. 



Perkins, H. C, unpublished thesis: Univ. of Kansas. 



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