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Analysis of the incidence and relative abundance of trace fossils in sediments from the eastern equatorial Pacific Ocean reveals distinct patterns of occurrence. A major control on variation in ichnofacies appears to be the organic carbon content of the sediments. Ichnofacies dominated by Zoophycos are characteristic of sites having diatomaceous sediments that are relatively rich in organic matter (0.5%-1.5%). Isolated Zoophycos burrows occur in darker, diatom-rich interbeds within nannofossil ooze sections. In thick, variably diatomaceous nannofossil oozes having lower Corg contents (0.1%-0.3%), but with pyrite or monosulfide, Chondrites is more evident and Zoophycos rarer. Sections characterized by the lowest sedimentation rates and Corg concentrations between 0% and 0.1 %, commonly include Skolithos, which is rare or absent in other ichnofacies. A series of large, subvertical, and open burrows, not previously described in deep-sea cores, is suggested to be the product of echiuran worms.

Variation of Trace Fossils and Ichnofacies in Neogene and Quaternary Pelagic Sediments from the Eastern Equatorial Pacific Ocean (Leg 138)