Gordia marina is a lower Cambrian ichnofossil, and is the most common trace fossil in the Kaili biota. It is often associated with the remains of a variety of dead organisms (i.e. fossils), suggesting that it was made my a scavenging worm-like creature. It takes the form of unlined, curving parallel-walled burrows that often end with a nub, probably created as the creature probed the over- or under-lying sediment.
It resembles Helminthopsis

Helminthopsis

Helminthopsis is an ichnogenus that is distinguished from the curving, parallel-sided, unlined Gordia because it never crosses over itself....

and Haplotichnus

Haplotichnus

Haplotichnus is an ichnogenus that is distinguished from the curving, parallel-sided, unlined Gordia because its bends are sometimes very sharp....