This diminutive Diplocraterion
parallelum occurrence is found within lower-shoreface sandstones of the
Wall Creek Member,
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.
© copyright Chuck D.
Howell, Jr. 2001-2022
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