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The lipids extracted from Cretaceous samples in the western North Atlantic Ocean (Sites 386 and 387) and Angola Basin (Site 364) were examined for terrigenous components. The distribution patterns of the n-alkanes and n-fatty acids indicate a mixed autoch¬ thonous marine and allochthonous terrigenous origin for the lipids. Minor amounts of diterpenoids are present as a result of a resinous plant component. Sterenes and predominantly 17/3(H)-hopanes constitute the polycyclic molecular markers, and indicate that these sediments are very immature. The kerogens and humic substances were examined for stable carbon isotope contents. The δC values for the samples from Site 386 are in the range typical for a terrigenous and/or lacustrine ori¬ gin, while the values for the other samples suggest a more marine origin. The presence of humic substances is a further indication of immaturity.

Organic Geochemistry of the Shales from the Northwestern Proto-Atlantic, DSDP Leg 43