58 G. H. WESTBY 
limestone or its contact with the Chattanooga shale. A velocity survey 
made six miles to the east of this well reveals similar data. Since our 
velocity information is never accurate for the identification of a re- 
flection closer than +20 feet, it would be entirely possible for this 
reflection to come from a harder bed of limestone in the base of the 
Mississippi lime. However, the writer was present at the drilling of 
the Mississippi lime in both wells in this vicinity and found no evi- 
dence either in the eek or in the mere to warrant the belief that 
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FIG. 9 
a reflection could be coming from a harder limestone stratum in the 
base of the Mississippi lime section. It is believed probable, therefore, 
that this reflection is coming from the contact of the Mississippi 
lime and the Chattanooga shale which theoretically should afford an 
especially good reflecting interface. The Viola limestone reflection 
therefore arrives in phase with this reflection and can not in this area 
be readily separated from it. 
RESULTS OF ST. CYR NO. I WELL 
The St. Cyr No. 1 well encountered the Viola limestone at a depth 
of 2,793 feet, or a sub sea datum of — 2,108. This is within 8 feet of 
302 
