One hundred and three ground water samples (predominantly springs) were analyzed for headspace light hydrocarbon gases and helium. Four of the formations (Arkansas Novaculite, Bigfork Chert, Stanley Shale, and Womble) having the highest mean methane values are the only Ouachita Mountain facies to produce petroleum or exhibit marginally commercial production. This observation suggests that the mean methane values are useful as an indication of the relative hydrocarbon content of these formations Anomalous helium values are generally associated with mapped faults.
Cox, Randel T. and Steele, Kenneth F.
"Implications of Hydrocarbon and Helium Gas Analyses of Springs from the Ouachita Mountains, Arkansas,"
Journal of the Arkansas Academy of Science: Vol. 38
, Article 9.
Available at: http://scholarworks.uark.edu/jaas/vol38/iss1/9