Massive trove of Canadian fossils gives near-unprecedented glimpse of Cambrian explosion

A site in the Kootenay National Park has proved a fantastic source of fossils from the Cambrian explosion, 542 million years ago.

In 2012, geologists discovered a major haul of fossils in Canada’s Kootenay National Park, in the Rocky Mountains near Calgary, Alberta. The find looked like it could shed further light on one of the most critical periods in the history of life on Earth, the Cambrian explosion, 542 million years ago - and the first study of its specimens, published in the journal Nature Communications, reveals that the find will “increase our understanding of early animal evolution” in an almost unparalleled way.

While there is evidence that life existed on Earth at least 3.5 billion years ago, life as we know it - multi-cellular and adapted to almost every part of the planet - appeared in what is called the Cambrian explosion, 542 million years ago. This was the era before animals colonised land, and indeed this period coincided with the first era of algae-like plants adapting to survive above water on the edges of bodies of water.

Over the course of around 80 million years the rate of evolution accelerated vastly, and the ancestors of almost all of the major phyla we see today first emerged. Quite why this happened is the subject of debate among scientists - it could have been any number of environmental or genetic factors - but there seemed to have been a relative frenzy of evolutionary competition.

The previously-dominant Ediacarans, which looked a bit like large floating sacks, were usurped and made extinct by the emergence of creatures that developed physical characteristics we still see today, like internal layering that separates digestive tracts from other organs, or having distinct “fronts” and “backs” (a trait known as bilateral symmetry). For an idea of what creatures exist today that missed out on all this, look to jellyfish.

In the rush to try and fill each new ecological niche, there were thousands of experiments that resemble nothing like anything that lives today. There was the spiky grazer Orthrozanclus and the superhero shrimp Stanleycaris; the bristleworm Insolicorypha and the arthopod Marrella, with huge spines on its head. There were also trilobites, thousands and thousands of different trilobites.

But these creatures lived in the sea, and were usually no more than a few centimetres in length at most. When they died - as they no doubt did by the million - they will have been eaten by other scavenging animals within a short time of settling on the sea floor. Our fossil record is dependent entirely on what were ancient landslides, when massive amounts of rock fell into the sea to crush entire shorelines, fossilising them. The few sites where this has happened, with whole ecosystems frozen in stone, are amazing - and none is better than the Burgess Shale. Nowhere else are the soft bodies of the ancient Cambrian explosion better-preserved, with detail so fine it’s possible to make out individual antennae or legs.

The original Burgess Shale find was in 1909, in the Yoho National Park, by palaeontologist Charles Walcott. It was formed by what’s known as a Lagerstätte formation, a particular kind of sedimentary preservation that happens so quickly not even microbes have time to break the tissue down, which is key to preserving as much detail as possible. Walcott spent decades gathering more than 65,000 fossils from the site, with its major significance only realised in the 1960s. And, while the Shale itself extends beyond the Yoho National Park, the best fossils were always found at Walcott’s original site.

However, it appears that the site in Kootenay National Park now rivals it for importance. The team of researchers - from institutes including the Royal Ontario Museum, the University of Toronto, and Uppsala University - gathered as many as 3,000 fossil specimens representing 50 different species in only 15 days.

The study’s lead author, Jean-Bernard Caron from the Royal Ontario Museum, said: "This new discovery is an epic sequel to a research story that began at the turn of the previous century, and there is no doubt in my mind that this new material will significantly increase our understanding of early animal evolution. The rate at which we are finding animals – many of which are new – is astonishing, and there is a high possibility that we'll eventually find more species here than at the original Yoho National Park site, and potentially more than from anywhere else in the world.”

Some of the preservation is so good that internal organs are visible. There’s also further evidence to support that hypothesis that Pikaia gracilens - a 4cm-long creature that looks a bit like an eel with tentacles - is the earliest known creature with the characteristics of vertebrates. It could even be the common ancestor of all vertebrates alive today.

Ian Steadman is a staff science and technology writer at the New Statesman. He is on Twitter as @iansteadman.

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Lol enforcement: meet the man policing online joke theft

A story of revenge, retweets, and Kale Salad. 

A man walks into a bar and he tells a joke. The man next to him laughs – and then he tells the same joke. The man next to him, in turn, repeats the joke. That bar’s name is Twitter.

If you’ve been on the social network for more than five minutes, you’ll notice that joke theft is rampant on the site. Search, for example, for a popular tweet this week (“did everyone just forget about the part of 2016 when literal clowns would chase people with knives in public and nobody really did anything” – 153,000 retweets) and you’ll see it has been copied 53 times in the last three days.

One instance of plagiarism, however, is unlike the others. Its perpetrator is the meme account @dory and its quick Ctrl+C, Ctrl+V has over 3,500 retweets. This account frequently copies the viral posts of Twitter users and passes them off – word for word – as its own. Many similar accounts do the same, including @CWGirl and @FatJew, and many make money by promoting advertising messages to their large number of followers. Twitter joke theft, then, is profitable.

In 2015, Twitter promised to clamp down on the unchecked plagiarism on its site. “This Tweet from [user] has been withheld in response to a report from the copyright holder,” read a message meant to replace stolen jokes on the site. It’s likely a message you’ve never seen.

Dissatisfied with this solution, one man took it upon himself to fight the thieves. 

“I'm a like happy internet kind of guy,” says Samir Mezrahi, a 34-year-old from New York who runs the Twitter account @KaleSalad. For the last six months, Mezrahi has used the account to source and retweet the original writers of Twitter jokes. Starting with a few hundred followers at the end of December 2016, Mezrahi had jumped to 50,000 followers by January 2017. Over 82,000 people now follow his account.  

“I've always been a big fan of like viral tweets and great tweets,” explains Mezrahi, over the sound of his children watching cartoons in the background. “A lot of people were fed up with the meme accounts so it’s just like a good opportunity to reward creators and people.”

Samir Mezrahi, owner of @KaleSalad

I had expected Mezrahi to be a teen. In actual fact he is a father of three and an ex-Buzzfeed employee, who speaks in a calm monotone, yet is enthusiastic about sharing the best content on Twitter. Though at first sourcing original tweets for Kale Salad was hard work, people now approach Mezrahi for help.

“People still reach out to me looking for vindication and just that kind of, I don’t know, that kind of acknowledgement that they were the originals. Because all so often the meme accounts are much larger and their tweets do better than the stolen tweet.”

But just why does having a tweet stolen suck so much? In the grand scheme of things, does it matter? Did everyone just forget about the part of 2016 when literal clowns would chase people with knives in public and nobody really did anything?

Meryl O’Rourke is a comedian and writer who tweets at @MerylORourke, and now has a copyright symbol (©) after her Twitter name. In the past she has had her jokes stolen and reposted, unattributed, on Facebook and Twitter and hopes this symbol will go some way to protecting her work.

“It’s hard to explain how it felt... as a struggling writer you’re always waiting for anything that looks like recognition as it could lead to your break,” she explains. “When your work gains momentum you feel like your opportunity ran off without you.

“Twitter is a test of a writer’s skill. To spend time choosing exactly the right words to convey your meaning with no nuance or explanation, and ensure popularity and a chuckle, in the space of only 140 characters – that’s hard work.”

However, Mezrahi has found not everyone is bothered by their tweets being stolen. I found the same man I reached out to with a stolen tweet who said he didn’t want to speak to me because it felt too “first world problems” to complain. Writers like O’Rourke are naturally more annoyed than random teenagers, who Mezrahi says are normally actually pleased about the theft.

“If you go to [a teenager’s] timeline it’s always the same thing. They’re replying to all their friends saying like ‘I’m famous’, they’re retweeting the meme accounts saying like ‘I did it’… they don’t mind as much it seems. It’s kind of like a badge of honour to them.”

Sometimes, people even ask Kale Salad to unretweet their posts. College students with scholarships, in particular, might not actually want to go viral – or some viral tweets may accidentally include personal information. On the whole, however, people are grateful for his work.

Yet the Kale Salad account does have unintended consequences. Mezrahi has now been blocked by the major meme accounts that frequently steal jokes, meaning he had to create alternate accounts to view their content. But just because he can’t see them doesn’t mean they don’t see him – and he has noticed that these accounts now actually come to his profile to steal jokes he has retweeted, in a strange role-reversal.

“There are definitely times when they're picking up things that I just retweeted, like I know they're like looking at me too,” he says. “It feels like vindicated or validated that they come to me.”

Mezrahi now works in social media on a freelance basis, but would be open to making Kale Salad profitable. Earlier this year he set up an account on Patreon – a site that allows fans to pay their favourite creators. Some people didn’t approve of this, tweeting to say he is “just retweeting tweets”. So far, Mezrahi has three patrons who pay him $50 (£39) a month.

“I mean I spend a certain amount of time on this and I think it’s a pretty good service, so I've been thinking about monetisation and thought that might be a route,” he explains. He believes he is providing an important service by “amplifying” creators, and he didn’t want to make money in less transparent ways, such as by posting sponsored advertisements on his account. Yet although many online love Kale Salad, they don’t, as of yet, want to pay him.

“Twitter should buy my account because I’m doing a good thing that people like every day,” he muses.

Many might still be sceptical of the value of a joke vigilante. For those whose jokes aren’t their bread or butter, tweet theft may seem like a very minimal problem. And although it arguably is, it’s still incredibly annoying. Writing in Playboy, Rob Fee explains it best:

“How upsetting is it when you tell a joke quietly in a group of friends, then someone else says it louder and gets a huge laugh? Now imagine your friend following you every day listening for more jokes because people started throwing money at him every time he repeated what you said. Also, that friend quit his job because he made enough to live comfortably by telling your jokes louder than you can. Odds are, you’d quickly decide to find new friends.”

For now, then, Kale Salad will continue his work as the unpaid internet police. “As long as people like the service, I don’t mind doing it. If that's a year or two years or what we'll see how the account goes,” he says.

“Twitter is fun and I like the fun days on the internet and I like to help contribute to that.

“The internet is for fun and not all the sadness that’s often there.”

Amelia Tait is a technology and digital culture writer at the New Statesman.

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