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FIGURE 3 Trace fossils in ancient inland erg deposits. (A-D) Invertebrate (probably insect) trace
fossils in the Middle Jurassic Entrada Sandstone, San Juan County, Utah. Entradichnus meniscus in
outcrop (A, scale bar ¼ 5 cm). Pustulichnus gregarious in outcrop (B, scale bar ¼ 5 cm). Close-up
views of E. meniscus and P. gregarious (C, D, scale bars ¼ 10 cm). (E, F) Vertebrate trace fossils
( Brasilichnium ) in the Lower Jurassic Nugget Sandstone, Summit County, Utah. Well-defined
trackway (showing toe imprints) in plan view of a tetrapod, probably synapsid (E, scale bar ¼ 5 cm).
Deformed (slurried) tracks of a tetrapod, probably synapsid (F, scale bar ¼ 5 cm).
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