Posted on 03/05/2019 9:57:48 AM PST by Gamecock
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.
The rocks came from an area in the remote Mackenzie Mountains of the Northwest Territories in Canada which 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 millimetre in size and others 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.
“For the first time, we saw evidence of large populations of worms living in the sediment – which was thought to be barren,” he said. "There were cryptic worm tunnels—burrows—in the mud on the continental shelf 500 million years ago, and more animals reworking, or bioturbating, the sea bed than anyone ever thought.”
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.
“Serendipity is a common aspect to my kind of research,” Pratt said. “I found these unusual rocks quite by accident all those years ago. On a hunch I prepared a bunch of samples and when I enhanced the images I was genuinely surprised by what I found," he said.
"This has a lot of implications which will now need to be investigated, not just in Cambrian shales but in younger rocks as well. People should try the same technique to see if it reveals signs of life in their samples."
The research was funded by the Natural Sciences and Engineering Research Council of Canada.
I bet it wasn’t a day over 499 million years.
Tremors is a documentary!
“Verm sign, Usul!”
“Dear Mom And Dad; I’m having a great time here at Camp Wormy. Today, our Camp Director, Mr. Compost, took us all out to look at some rocks. He showed us his favorite rock. He called it “Rocky”. He said that Rocky was the only person that really understood him. Later, they hauled Mr. Compost off to the funny farm. Tomorrow, we’re doing arts and crafts. I’m going to make a supercollider! Love, Junior”
A gross oversimplification, insofar as it glosses over the rich (if enigmatic) biota of the preceding Ediacaran Period.
Regards,
Right.
ML/NJ
*ping*
Is this the giant worm thread or the Adam Schiff thread or is there even a difference?
*That state borders on Canada for those educated in public school.
Rocky and Bullwinkle knew this years ago. They herded worms from Frostbite Falls Minnesota* for a living.
*That state borders on Canada for those educated in public school.
Growing up in the fifties and sixties, not a little of my knowledge base was obtained from Bugs Bunny.
The TOE can’t get from basic elements to amino acids to a single protein. A single protein is one bolt in the F150 that is a simple bacterium. The “theory” is not a scientific theory it is anecdote turned into religion.
I remember that episode when they were driving them to market and the resultant worm stampede. *Breathtaking*
On a side note: My knowledge of classical music would be almost non-resistant were it not for Looney Tunes!
"Oh Bwoonhilda, you're so wove-wy!"
Non-resistant = Non-existant
Stupid autocorrect I am totally tired of your bullshirt.
Road signs along the superhighway would warn worms of “bait shops above”.
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