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Asa Kaplan

The rock there is either early Cenozoic or else Mesozoic. Ediacarans are out of the question, not only for this reason, but for morphological reasons: no known Ediacaran is spiral- or tube-shaped.

This appears to be the trace of a worm or other creature that fed in a spiral outward from a central starting point. It consumed the sediment whole and released the digested sediment behind it. If it showed a rigid, curved outer shell, then we could talk about what kind of snail or cephalopod shell it is. But since the outlines are wavy and irregular, it is almost certainly a feeding trace.

I don’t know my trace fossil taxonomy well enough to put a genus identification on this fossil, but these lecture notes contain some spiral feeding traces you might take a look at: