DISCOVERY BY REFLECTION SEISMOGRAPH 59 
the predicted datum. The uniformity of the small structure, as por- 
trayed by the detailed seismic work, suggested satisfactory accuracy 
previous to the drilling. At the present time St. Cyr No. 1 well is in 
the process of being completed as a flowing oil and gas well from the 
Wilcox sand. 
CONCLUSIONS 
We may conclude from the foregoing that the seismic reflection 
method, if correctly applied, is entirely suitable for the discovery and 
delineation of the small Wilcox structures as found in Okmulgee 
County. The great necessity for detailed work on a problem of this 
type must be again emphasized. Our seismic work may be entirely 
satisfactory as to quality but deficient in quantity and correct geologic 
interpretation. Small subsurface faults may be easily located by a 
method of continuous profiling if the fault is a clean break with little 
or no deformation of the formations contiguous to it. All small sources 
of error must be carefully examined, cap lag, or time break trouble 
entirely eliminated, and definite determinative initial impeti secured 
to insure satisfactory surface correction zone data. Absolute de- 
termination of average overall velocity to the formation is entirely 
unnecessary so long as the proper correlation of reflections is made. 
From the method used in this area and the care which has been taken 
in all corrections it is believed each point shown on the detailed map 
represents an accurate depth to the Viola limestone within ro feet. 
It is intended to use this area as a field laboratory and to carry out 
further research in regard to variation of velocity on structure and 
variation of surface correction zone. The writer invites personal com- 
munications suggesting problems which may be attacked with this 
particular set of conditions. 
303 
