DISCOVERY BY REFLECTION SEISMOGRAPH 51 
Where possible each shot hole was utilized for shooting in two direc- 
tions. Shots for the determination of the surface correction zone were 
placed at a distance of one hundred feet on either side of the geophone 
spread. Simplified refraction formulae were used in calculation of the 
Sw 
dat 37° 
600 -1300 
August 31938 


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thickness and time occupied in this zone. These correction shots were 
buried at a depth of about ro feet in the alluvium and 5 feet in the 
Pennsylvanian shale. This procedure as outlined is more or less 
standard correlation shooting technique as was practiced in Okla- 
homa during 1933 and 1934. All calculations and maps were made 
in time originally but were translated into feet for this paper. 
295 
