Fossils that formed 890 million years ago in what is now the Northwest Territories may be by far the oldest evidence of animal life ever found, a controversial new Canadian study suggests.
The tiny fossils are “possible” remains of the skeleton of an ancient sponge, says a new study by Elizabeth Turner, professor of earth sciences at Laurentian University in Sudbury, Ont., published in Nature today.
A cautious news release from the journal titled “Potential Evidence for the Earliest Animal Life” said, “the findings, if verified, may represent the earliest known fossilized animal body and may pre-date the next-oldest undisputed sponge fossils by around 350 million years.”
The previous oldest confirmed sponge — widely considered to be the earliest group of animals — lived 535 million years ago.
This is the skeleton of a modern bath sponge or horny sponge from Greece seen under a microscope, which has a similar structure to the fossils. (Elizabeth Turner/Laurentian University)
Turner said she first found the fossils in pockets and crevices of ancient reefs called stromatolites built by photosynthetic microbes called cyanobacteria while studying the microbes themselves for her PhD in the 1990s.
While the ancient reefs are in the Arctic now — more specifically, their fossilized remains are limestone deposits in the Mackenzie Mountains, which are located in the Northwest Territories near the Yukon border — 890 million years ago, they were much closer to the equator in the middle of a supercontinent called Rodinia, in a shallow inland sea.
The fossils were worm-like and half the width of a human hair, branching and then rejoining. Turner was intrigued, as they were complex structures and she suspected they weren’t made by microbes. She puzzled over them for decades, returning periodically to gather more samples.
“They are truly identical to the ones that I had in my much older rocks,” Turner said. “There weren’t any other truly viable interpretations of the material.”
Elizabeth Turner, a Laurentian University earth sciences professor, was the author of the new paper. In this photo, she does unrelated field work on northern Baffin Island in Nunavut. (C. Gilbert)
The reef pockets and crevices in the Mackenzie Mountains where the worm-like sponge fossils were found are similar to the environments where sponges live today, she said.
They were too dark for the cyanobacteria themselves to live in, so the microbes wouldn’t compete with the sponges for space and other resources. But it was close enough for a sponge to capture some of the oxygen produced by the microbes, which was in short supply at that time.
The microbes might also produce a source of food in the form of slime — something their modern relatives still do, giving them their nickname, “pond scum.”
What other scientists think
In an unusual move, since peer review is usually anonymous, Nature disclosed that Reitner, Riding and Lee had all peer reviewed Turner’s article. Riding and Lee both confirmed they think Turner’s interpretation is correct.
Riding says it’s a “very interesting discovery.”
“The orderliness and neatness of this pattern, I think, is very distinctive,” he told CBC News in a phone interview, noting that the fossils are exceptionally well-preserved. “And if I found that pattern in younger rocks, I would say for sure that it was a sponge.”
He said that sponges have long been thought to be the earliest animal and were predicted to have evolved around the time that these fossils would have formed.
That said, Riding acknowledged that the simplicity of the fossils and their extraordinary age mean some other scientists might need more convincing.
He thinks more people will start to look for these types of fossils, and may start to check them for the biochemical fingerprints left behind by sponges, which have been found in younger fossils. That would convince the doubters, he said, but added that “in my opinion, it is a sponge fossil.”
This is one of the sites in the Mackenzie Mountains of the Northwest Territories. The mountains contain limestone from huge ancient reefs, which is where the fossils were found. (Elizabeth Turner/Laurentian University)
Some researchers skeptical
Other researchers contacted by CBC News were more skeptical.
He said fossils are usually identified by unique and distinctive characteristics for that group, and there are many for sponges, including hard skeletal elements called spicules that fossilize well. Those were not found in this fossil.
While horny sponges don’t have spicules, Antcliffe said they’re one of the “weirdest” groups of modern sponges. He added that spicules should exist in even the earliest sponges, since they exist in a microbe that is thought to be the ancestor of sponges.
Modern bath sponges or horny sponges don’t have hard skeletons, but are supported by networks of protein. The fossils are thought to be the remains of similar networks. (Svetlana Lukienko/Shutterstock)
Unlike Turner and Riding, he thinks the fossils could have been made by many different kinds of microbes. “These things could be absolutely anything,” he told CBC News. “There’s just nothing distinctive here at all.”
Qing Tang, a postdoctoral researcher at the University of Hong Kong, has previously written about the lack of really old sponge fossils being an “annoying problem for paleontologists,” given that they’re thought to have evolved much earlier than the oldest fossils, and most modern sponges (but not horny sponges) have hard skeletons that should be easily fossilized.
Some of his research has found that some very old sponges may not have had those hard skeletons.
But he said in this case, the fossils remind him of another fossil from between 635 million and 538 million years ago that was originally thought to be a sponge. After more detailed 3D analysis, researchers decided the fossils were more likely made by microbes.
He suggested more sophisticated 3D analysis are needed to confirm Turner’s discovery.
“This discovery is overall very interesting,” Qing said in an email.
“It will be a big step towards a better understanding of early animal evolution if the keratose sponge interpretation is eventually confirmed, particularly given its age… However, as is denoted in the title, these structures are best called possible sponge fossils due to relatively few characters preserved.”
TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.
Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.
Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.
The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.
The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.
It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.
Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.
Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.
Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.
Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.
Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.
The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”
VICTORIA – The British Columbia government is partnering with a bear welfare group to reduce the number of bears being euthanized in the province.
Nicholas Scapillati, executive director of Grizzly Bear Foundation, said Monday that it comes after months-long discussions with the province on how to protect bears, with the goal to give the animals a “better and second chance at life in the wild.”
Scapillati said what’s exciting about the project is that the government is open to working with outside experts and the public.
“So, they’ll be working through Indigenous knowledge and scientific understanding, bringing in the latest techniques and training expertise from leading experts,” he said in an interview.
B.C. government data show conservation officers destroyed 603 black bears and 23 grizzly bears in 2023, while 154 black bears were killed by officers in the first six months of this year.
Scapillati said the group will publish a report with recommendations by next spring, while an independent oversight committee will be set up to review all bear encounters with conservation officers to provide advice to the government.
Environment Minister George Heyman said in a statement that they are looking for new ways to ensure conservation officers “have the trust of the communities they serve,” and the panel will make recommendations to enhance officer training and improve policies.
Lesley Fox, with the wildlife protection group The Fur-Bearers, said they’ve been calling for such a committee for decades.
“This move demonstrates the government is listening,” said Fox. “I suspect, because of the impending election, their listening skills are potentially a little sharper than they normally are.”
Fox said the partnership came from “a place of long frustration” as provincial conservation officers kill more than 500 black bears every year on average, and the public is “no longer tolerating this kind of approach.”
“I think that the conservation officer service and the B.C. government are aware they need to change, and certainly the public has been asking for it,” said Fox.
Fox said there’s a lot of optimism about the new partnership, but, as with any government, there will likely be a lot of red tape to get through.
“I think speed is going to be important, whether or not the committee has the ability to make change and make change relatively quickly without having to study an issue to death, ” said Fox.
This report by The Canadian Press was first published Sept. 9, 2024.
The European Space Agency is fast-tracking a new mission called Ramses, which will fly to near-Earth asteroid 99942 Apophis and join the space rock in 2029 when it comes very close to our planet — closer even than the region where geosynchronous satellites sit.
Ramses is short for Rapid Apophis Mission for Space Safety and, as its name suggests, is the next phase in humanity’s efforts to learn more about near-Earth asteroids (NEOs) and how we might deflect them should one ever be discovered on a collision course with planet Earth.
In order to launch in time to rendezvous with Apophis in February 2029, scientists at the European Space Agency have been given permission to start planning Ramses even before the multinational space agency officially adopts the mission. The sanctioning and appropriation of funding for the Ramses mission will hopefully take place at ESA’s Ministerial Council meeting (involving representatives from each of ESA’s member states) in November of 2025. To arrive at Apophis in February 2029, launch would have to take place in April 2028, the agency says.
This is a big deal because large asteroids don’t come this close to Earth very often. It is thus scientifically precious that, on April 13, 2029, Apophis will pass within 19,794 miles (31,860 kilometers) of Earth. For comparison, geosynchronous orbit is 22,236 miles (35,786 km) above Earth’s surface. Such close fly-bys by asteroids hundreds of meters across (Apophis is about 1,230 feet, or 375 meters, across) only occur on average once every 5,000 to 10,000 years. Miss this one, and we’ve got a long time to wait for the next.
When Apophis was discovered in 2004, it was for a short time the most dangerous asteroid known, being classified as having the potential to impact with Earth possibly in 2029, 2036, or 2068. Should an asteroid of its size strike Earth, it could gouge out a crater several kilometers across and devastate a country with shock waves, flash heating and earth tremors. If it crashed down in the ocean, it could send a towering tsunami to devastate coastlines in multiple countries.
Over time, as our knowledge of Apophis’ orbit became more refined, however, the risk of impact greatly went down. Radar observations of the asteroid in March of 2021 reduced the uncertainty in Apophis’ orbit from hundreds of kilometers to just a few kilometers, finally removing any lingering worries about an impact — at least for the next 100 years. (Beyond 100 years, asteroid orbits can become too unpredictable to plot with any accuracy, but there’s currently no suggestion that an impact will occur after 100 years.) So, Earth is expected to be perfectly safe in 2029 when Apophis comes through. Still, scientists want to see how Apophis responds by coming so close to Earth and entering our planet’s gravitational field.
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“There is still so much we have yet to learn about asteroids but, until now, we have had to travel deep into the solar system to study them and perform experiments ourselves to interact with their surface,” said Patrick Michel, who is the Director of Research at CNRS at Observatoire de la Côte d’Azur in Nice, France, in a statement. “Nature is bringing one to us and conducting the experiment itself. All we need to do is watch as Apophis is stretched and squeezed by strong tidal forces that may trigger landslides and other disturbances and reveal new material from beneath the surface.”
The Goldstone radar’s imagery of asteroid 99942 Apophis as it made its closest approach to Earth, in March 2021. (Image credit: NASA/JPL–Caltech/NSF/AUI/GBO)
By arriving at Apophis before the asteroid’s close encounter with Earth, and sticking with it throughout the flyby and beyond, Ramses will be in prime position to conduct before-and-after surveys to see how Apophis reacts to Earth. By looking for disturbances Earth’s gravitational tidal forces trigger on the asteroid’s surface, Ramses will be able to learn about Apophis’ internal structure, density, porosity and composition, all of which are characteristics that we would need to first understand before considering how best to deflect a similar asteroid were one ever found to be on a collision course with our world.
Besides assisting in protecting Earth, learning about Apophis will give scientists further insights into how similar asteroids formed in the early solar system, and, in the process, how planets (including Earth) formed out of the same material.
One way we already know Earth will affect Apophis is by changing its orbit. Currently, Apophis is categorized as an Aten-type asteroid, which is what we call the class of near-Earth objects that have a shorter orbit around the sun than Earth does. Apophis currently gets as far as 0.92 astronomical units (137.6 million km, or 85.5 million miles) from the sun. However, our planet will give Apophis a gravitational nudge that will enlarge its orbit to 1.1 astronomical units (164.6 million km, or 102 million miles), such that its orbital period becomes longer than Earth’s.
It will then be classed as an Apollo-type asteroid.
Ramses won’t be alone in tracking Apophis. NASA has repurposed their OSIRIS-REx mission, which returned a sample from another near-Earth asteroid, 101955 Bennu, in 2023. However, the spacecraft, renamed OSIRIS-APEX (Apophis Explorer), won’t arrive at the asteroid until April 23, 2029, ten days after the close encounter with Earth. OSIRIS-APEX will initially perform a flyby of Apophis at a distance of about 2,500 miles (4,000 km) from the object, then return in June that year to settle into orbit around Apophis for an 18-month mission.
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Furthermore, the European Space Agency still plans on launching its Hera spacecraft in October 2024 to follow-up on the DART mission to the double asteroid Didymos and Dimorphos. DART impacted the latter in a test of kinetic impactor capabilities for potentially changing a hazardous asteroid’s orbit around our planet. Hera will survey the binary asteroid system and observe the crater made by DART’s sacrifice to gain a better understanding of Dimorphos’ structure and composition post-impact, so that we can place the results in context.
The more near-Earth asteroids like Dimorphos and Apophis that we study, the greater that context becomes. Perhaps, one day, the understanding that we have gained from these missions will indeed save our planet.
