Figure F17. Core photograph of abrupt boundary between poorly sorted coarse sand with thick shells above and clayey silt with dispersed terrestrial organic matter below (at 105 cm) (Unit III; 313-M0027A-102R-2, 95–115 cm). Surface is bioturbated with burrows filled by coarse sand and marks an abrupt shallowing from an offshore/prodelta setting to shoreface. Surface separates lithostratigraphic Units III and IV.
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