Figure AF2. Representative lithofacies from the Double Trouble corehole: Kirkwood/Cohansey contact at 165.1 ft (50.3 m) and cores showing a progression from delta front to middle neritic sand in the Kirkwood Formation: delta front (214–216 ft; 65.2–65.8 m), prodelta (254–256 ft; 77.4–78.0 m), shelf to prodelta (271.4–273.4 ft; 82.7–83.3 m), and middle neritic sand (280.5–282.5 ft; 85.5–86.1 m).