[Rockhounds] Ediacaran worm fossil rolls back origins of animal life

[Paul]

These tracks were made by a foot-long worm on a "death
march" 550 million years ago. Newsweek, Sept. 4, 2019 (has pictures )
https://www.newsweek.com/ancient-worm-tracks-evolution-life-1457624

Barras, C., 2019. Ancient worm fossil rolls back origins of
animal life. Nature, 573(7772), p.15.
https://www.nature.com/articles/d41586-019-02556-x
https://www.nature.com/magazine-assets/d41586-019-02556-x/d41586-019-02556-x.pdf

Chen, Z., Zhou, C., Yuan, X. and Xiao, S., 2019. Death
march of a segmented and trilobate bilaterian elucidates
early animal evolution. Nature, pp.1-4.
https://www.nature.com/articles/s41586-019-1522-7

Yours,

Paul H.