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Ophiomorpha and other nonmarine trace fossils from the eocene ione formation california usa



Ophiomorpha and other nonmarine trace fossils from the eocene ione formation california usa



Journal of Paleontology 58(2): 542-549



Braided stream deposits of the lower to middle Eocene Ione Formation in east-central California contain many different trace fossils. The traces, lined and unlined burrows and trails, are most abundant in facies that represent transverse bars and a variety of floodplain environments. Burrow concentrations range from single isolated traces to high density concentrations, leaving some arkosic sandstone units with a mottled appearance. Ophiomorpha is the most prominent of the trace fossils. It is a sand-filled, clay-lined burrow with nodose exterior. Ophiomorpha is found in sandstone units, and it occurs as isolated individuals and local groupings. Associated with Ophiomorpha are other unlined burrows and trails with morphologies ranging from single tubes to 3-dimensional networks. These different trace fossils most likely represent activities performed by different organisms inhabiting different microenvironments, defined by differences in moisture condition, sediment organic content and grain size.

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Accession: 006036181

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