Worm Burrow fossil along the Grand Canyon rim trail near Bright Angel Trailhead | Pics4Learning
Fossil Worm Burrows Reveal Very Early Terrestrial Animal Activity and Shed Light on Trophic Resources after the End-Cretaceous Mass Extinction | PLOS ONE
Giant predatory worm's ancient fossil burrows discovered | CBC News
Exploring Borings – More Than A Dodo
Trace fossils in outcrop. (a) Large burrows (arrows) in bedded... | Download Scientific Diagram