Trace fossils of the Aztec Sandstone in Southern Nevada including an undescribed mammaloid ichnotaxon

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The Aztec Sandstone represents the southwestern margin of the great Jurassic Navajo-Nugget-Aztec sand sea. A diverse ichnofauna has long been known to occur in the Navajo and Nugget formations, and in 2006 multiple ichnotaxa were reported from the Aztec Sandstone in the Mescal Range of eastern California. Anomalously, however, prior to 2011 only one ichnotaxon of trace fossils had been reported in the widely exposed Aztec Sandstone in southern Nevada; that occurrence consisted of multiple trackways of the therapsid track Brasilichnium at a single site in Valley of Fire State Park.

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