Marvellous. Its the biggest worm trail i have never watched.... in Tabernas deserts (Almería) you can see lots of these, sometimes with marks of legs also (myriapods) but never did i watch so big.
Going not so far in the time, I know a place in a moorish wall inserted on the ruins of a medieval castle, that there is a brick with the foot of a cat stamped on it (printed when the brick was being dried). We made an study looking for possible animals in the place , around 500-1000 years ago... and finally it was totally sure the step belonged to a cat that lived in Almería place 5-10 centuries ago.
Regards and congratulations for your discovery.