Prehistoric Worm ‘Superhighway’ Discovered

Prehistoric worms populated the sea bed 500 million years ago — evidence that life was active in an environment thought uninhabitable until now, research by the University of Saskatchewan (USask) shows. (Image: University of Saskatchewan)

The sea bed in the deep ocean during the Cambrian period was thought to have been inhospitable to animal life because it lacked enough oxygen to sustain it. But research published in the scientific journal Geology reveals the existence of fossilized worm tunnels dating back to the Cambrian period­­ 270 million years before the evolution of dinosaurs.

The discovery, by USask Professor Brian Pratt, suggests that animal life in the sediment at that time was more widespread than previously thought. The worm tunnels — burrows where worms lived and munched through the sediment — are invisible to the naked eye. But Pratt “had a hunch” and sliced the rocks and scanned them to see whether they revealed signs of ancient life.

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The rocks came from an area in the remote Mackenzie Mountains of the Northwest Territories in Canada that Pratt found 35 years ago. Pratt then digitally enhanced images of the rock surfaces so he could examine them more closely. Only then did the hidden “superhighway” of burrows made by several different sizes and types of prehistoric worm emerge in the rock.

Some were barely a millimeter in size, while others were as large as a finger. The smaller ones were probably made by simple polychaetes — or bristle worms — but one of the large forms was a predator that attacked unsuspecting arthropods and surface-dwelling worms. Pratt said he was “surprised” by the unexpected discovery, adding:

Pratt, a geologist and paleontologist and Fellow of the Geological Society of America, found the tunnels in sedimentary rocks that are similar to the Burgess Shale, a famous fossil-bearing deposit in the Canadian Rockies. The discovery may prompt a rethink of the level of oxygenation in ancient oceans and continental shelves.

The Cambrian period saw an explosion of life on Earth in the oceans and the development of multi-cellular organisms, including prehistoric worms, clams, snails, and ancestors of crabs and lobsters. Previously, the seas had been inhabited by simple, single-celled microbes and algae.

It has always been assumed that the creatures in the Burgess Shale — known for the richness of its fossils — had been preserved so immaculately because the lack of oxygen at the bottom of the sea stopped decay, and because no animals lived in the mud to eat the carcasses.

Pratt’s discovery, with co-author Julien Kimmig, now of the University of Kansas, shows there was enough oxygen to sustain various kinds of worms in the sea bed. Pratt said:

Provided by: University of Saskatchewan [Note: Materials may be edited for content and length.]

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