MAIL ONLINE: Fossils from the first organisms on Earth capable of active movement could upend the timeline of animal evolution

Description

A new set of trace fossils left by some of the first ever organisms capable of active movement have been discovered by researchers. 

The 'trace' fossils are not physical remains such as bones or body parts - but rather the tracks and burrows left by living organisms. 

The research team suggests that these burrows were created by 'nematoid-like organisms,' similar to a modern-day roundworm, that used an undulating locomotion to move through the sediment, leaving the trace fossils behind.