Some months ago, at the request of O. A. Seager of the Carter Oil Company, B. B. Bradish sent the writer a small piece of core from Billings, Montana, stating that it was from a deep well north of the Black Hills. Because of the graptolites in the core, information that it represented the equivalent of a zone 150 feet above the base of the Viola limestone on West Spring Creek in the Western part of the Arbuckle Mountains was sent at once. Recently, O. A. Seager wrote that the core came from a depth of 7,727-30 feet (with graptolites...
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