Diplocraterion parallelum

    This diminutive Diplocraterion parallelum occurrence is found within lower-shoreface sandstones of the Wall Creek Member, Frontier Formation, Powder River Basin, Wyoming.  Note the protrusive sprieten, which indicates downward movement through the sediment.  The parallel limbs of the u-shaped tube suggest no significant growth of the trace maker.  Downward diverging limbs would indicate growth of the organism.  In plan view, the two surface openings of larger assemblages tend to be oriented alike.  Opening orientation and  alignment is sometimes influenced by currents suggesting the up-current opening was for the organism's mouth and the down-current opening was for the anus. A small Skolithos is also visible just to the left.

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