n. pl.1.(Paleon.) Fossil tracks of annelids.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Trace fossils Nereites, Helminthopsis, Cruziana, Lockeia, Cochlichnus, Arenicolites, Archaeonassa, Aulichnites, Phycodes and Planolites are found.
The determined ichnotaxa are: Chondrites isp., Helminthoraphe flexuosa, Multina minima, Nereites irregularis, Ophiomorpha annulata, Ophiomorpha rudis, Paleodictyon strozzii, Planolites isp., ?Squamodictyon isp., and Taenidium crassum (Fig.
The trace-fossil assemblage of the Ezkaba Sandstone Formation, the older unit considered in this work, is characteristic of the deep-sea Nereites ichnofacies, as revealed by the presence of graphoglyptids (Uchman and Wetzel, 2011; Wetzel and Uchman, 2012).
vertebralis), supporting the differentiation of the Ophiomorpha rudis ichnosubfacies of the Nereites ichnofacies.
and Helminthorhaphe flexuosa) suggests the Paleodictyon ichnosubfacies of the Nereites ichnofacies or a mixed Paleodictyon-Ophiomorpha rudis ichnosubfacies ichnoassemblage.
Gordia, Helminthopsis, and Planolites are widespread and common in three ichnofacies: Cruziana, Mermia, and Nereites. Palaeophycus is restricted to the Cruziana, is the genus attributed to this ichnofossil.
Similar examples (Nereites) occur in the Mississippian Hartselle Sandstone of Alabama in an estuarine paleoenvironment.
These trace fossils suggest a Nereites ichnofacies indicative of a deep-water environment (Gingras et al.
Four groups were originally identified (the Skolithos, Cruziana, Zoophycos, and Nereites ichnofacies--following Bromley 1996, we do not italicize ichnofacies).
However, in the marine realm, Bromley and Asgaard (1991) considered the Nereites ichnofacies to comprise a Zoophycos ichnofacies, and one or more as yet unnamed graphoglyptid ichnofacies.
Buatois and Mangano (1998) considered it the nonmarine equivalent of the Cruziana-, Zoophycos-, and Nereites ichnofacies in its environmental context, whereas Bromley (1996) considered it only equivalent to the Nereites ichnofacies.