Worms may have first burrowed into mud more than 550 million years ago. The tunnels they apparently created, preserved in fossilized sediments and reported in a new study, could be the oldest example of animals significantly churning up the ground.
Worms may have first burrowed into mud more than 550 million years ago. The tunnels they apparently created, preserved in fossilized sediments and reported in a new study, could be the oldest example of animals significantly churning up the ground.