Anatomy of a Type II Turbidite Depositional System: Upper Jackfork Group, Degray Lake Area, Arkansas
Hisham A. Al-Siyabi, 2000. "Anatomy of a Type II Turbidite Depositional System: Upper Jackfork Group, Degray Lake Area, Arkansas", Fine-Grained Turbidite Systems, Arnold H. Bouma, Charles G. Stone
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The upper Jackfork Group in the DeGray Lake area, Arkansas, represents a Type II turbidite depositional system with proximal lobes, distal lobes, and channel fills. Diagnostic facies assemblages and sand/shale ratios characterize each of these deposits. In addition, vertical facies arrangements, upward bed thickness trends, and downcurrent bed continuity vary among these deposits.
The depositional setting is divided into three areas: upper fan, transition zone, and middle to lower fan. In these settings, channel fills are envisioned to occur in the upper-fan region. While proximal lobes dominate the transition zone, distal lobes populate the middle- to lower-fan region.