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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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