Ubiquitous, large-scale, candidate Piscichnus waitemata occurrences (nektonic organism's excavation pits) are seen in delta front sandstones of the Wall Creek Member of the Frontier Formation, Powder River Basin, Wyoming.  The ethological interpretation and classification of these particular trace fossils is Fodinichnia...a feeding behavior trace These passively infilled depressions may record the feeding behavior of nektonic vertebrates, e.g. blow holes created by modern day sting rays (Piscichnus waitemata).  These occurrences are unusually large Piscichnus isp. occurrences.  However, they may also record combined feeding and dwelling, or hiding behaviors—Fodinichnia and Domichnia.

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