Figure F1. Total organic carbon (TOC) and total nitrogen (TN) concentrations and isotopic composition (δ13C, δ15N). Carbon (solid symbols) and nitrogen (open symbols) data are presented as downcore profiles at (A) Brazos-Trinity Basin IV and (B) Ursa Basin sites. Diamonds = Hole A, circles = Hole B, squares = Hole C, triangles = Hole D. Lithologic units: green = clay/mud, yellow = sand, orange = silt, blue = foraminifer-bearing clay.
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