Skolithos (small)

Three small mud-lined Skolithos traces are seen in this photograph.  The occurrence of the vertical burrows at the top of the sand bed suggests a minor hiatus, or period of non-deposition, which lasted long enough for colonization to occur.  These traces are found within tide-influenced delta front sandstone facies of the Wall Creek Member of the Frontier Formation, Powder River Basin, Wyoming.

Skolithos (mud-lined)

A single mud-lined Skolithos occurrence is seen in this photograph.  This trace is cross-cutting three normally-graded structureless to flat-stratified sandstone beds, which are interpreted to preserve sediment-gravity deposits.  These traces are found within delta front sandstone bedset found within a single parasequence in the Wall Creek Member of the Frontier Formation, Powder River Basin, Wyoming.

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