488 



Subsurface Geologic Methods 



CABIN CREEK 



JO o r g 3 ^ bffi, 



--- spectrochemical correlation 



:::" mississippian limestones 



rrillZZZ- NORTHWESTERN MONTANA 



Figure 231. Graphic method of recording spectrochemical data. (Reproduced per- 

 mission Am. Assoc. Petroleum Geologists.) 



As it became apparent that qualitative analysis was not the answer, 

 efforts were turned toward quantitative analysis by spectrochemical meth- 

 ods, and, after some difficulties, a satisfactory technique was evolved and 

 useful data were obtained. The results of this investigation and the pro- 

 cedure followed were presented in 1946.-^ Figure 231 is reprinted from 

 the original paper; it illustrates a number of zones, determined by quan- 

 titative spectrochemical character and traceable from section to section. 



The writers, in the intervening period, have not pursued the matter 

 further at a publication level. Subsequent development, to the writers' 

 knowledge, has taken place in the realm of industrial research, but the 

 results are not available for publication. This note is included in the 

 present symposium in the interest of completeness and is intended to bring 

 up to date certain questions of technique, application, and interpretation. 

 Interested readers are referred to the original paper for details not re- 

 peated here. 



^ Sloss, L. L., and Cooke, S. R. B., Spectrochemical Sample Logging of Limestones : Am. Assoc. Pe- 

 troleum Geologists Bull., vol. 30, no. 11, pp. 1888-1898, Nov. 1946. 



