Half-billion-year-old fossils are the oldest animal footprints ever found

09 Juin, 2018, 11:26 | Auteur: Therese Cote

The study team involves the scientists from the Chinese Academy of Sciences' Nanjing Institute of Geology and Palaeontology.

The rock layers where the fossils were found date between 551 million and 541 million years ago, suggesting the footprints were made some time between those dates.

An global team of scientists has just discovered fossil footprints in China, dating back approximately 635-541 million years, in the Ediacaran Period. Today, these creatures are spread throughout the Earth and are among the most diverse forms of animal life on the planet, notes the report.

Both the footprints and the borrows are known as "trace fossils", a term that refers to fossilized remnants that animals leave behind, such as fossilized poop, rather than fossils of the animals themselves.

They are often assumed to have appeared and radiated suddenly during the so-called "Cambrian Explosion" about 541 to 510 million years ago, but scientists now tend to consider that their evolutionary ancestry was rooted in the Ediacaran Period.

The paleontological team found two rows of footprints that represent not only the earliest footprints ever found but also the earliest known record of an animal with legs. They are often assumed to have appeared and radiated suddenly during the "Cambrian Explosion" about 541-510 million years ago, although it has always been suspected that their evolutionary ancestry was rooted in the Ediacaran Period.

Avant un G7 difficile, Macron et Trudeau unis face à Trump
Trudeau et Trump, qui doivent s'entretenir vendredi, auront "beaucoup de choses à se dire", a-t-il ajouté. Vendredi, ce dernier s'est dit "d'accord" avec Donald Trump , qui a appelé le G7 à réintégrer la Russie.

Au G7, la meilleure défense de Trump, c'est l'attaque
Déjà mercredi, il avait lancé comme un avertissement l'adresse de son partenaire américain: "Aucun dirigeant n'est éternel". Même tonalité chez Emmanuel Macron qui a multiplié les tweets contre "la loi du plus fort " et toute " hégémonie ".

Aux cotés de Trudeau, Trump joue l'apaisement au G7
Pour la France, le G7 doit impérativement reconnaître la nécessité de "règles collectives" dans le commerce international. Trump, fidèle à sa position selon laquelle Moscou ne peut être simplement ignoré dans les grands dossiers internationaux.

"The irregular arrangement of tracks in the. trackways may be taken as evidence that the movement of their trace maker's appendages was poorly coordinated and is distinct from the highly coordinated metachronal (wave-like) rhythm typical of modern arthropods", the Chinese and American team led by Dr Shuhai Xiao, from Virginia Tech in the USA, wrote in the journal Science Advances.

In the end, without a complete fossil record, we can not make any presumptions regarding the needs or the habits of the animal.

The research was published Wednesday in the journal Science Advances by scientists from the Chinese Academy of Sciences and Virginia Tech.

Mystery surrounds the one-millimetre long creatures that made the prints, since no trace of their bodies has been found. It is uncertain if the organism belongs to the arthropod family, although the researchers believe it could be a bilaterian with paired feet. The trackways also indicate a connection to burrowing, suggesting that whatever animal made the tracks might have had a habit of digging into sediments.

The researchers, led by Zhe Chen and Shuhai Xiao, say it's highly likely the prints were produced by a bilaterian animal with paired appendages, but they know very little beyond that.

Conseillé:

  • Warren, Gardner Unveil Marijuana Bill Easing Federal Enforcement

    Warren, Gardner Unveil Marijuana Bill Easing Federal Enforcement

    My view is clear: "The federal law remains in effect nationwide, just as it does for heroin and cocaine". A legally grown marijuana plant is pictured at farm in OR in this undated stock image.
    Un réfugié irakien, cadre présumé du groupe État islamique, arrêté à Lisieux

    Un réfugié irakien, cadre présumé du groupe État islamique, arrêté à Lisieux

    Bien qu'aucune information concrète n'ait filtré sur les conditions de sa venue en France, on sait que Ahmed H. On le soupçonne d'avoir participé au massacre militaire du camp de Tikrit au nord de Bagdad en 2014.
    Must do better Halep into third Roland Garros final, faces Stephens

    Must do better Halep into third Roland Garros final, faces Stephens

    This year, she was two points from defeat in the third round against Camila Giorgi of Italy before turning that match around. The Romanian broke at the start of the second set and then held for 6-3 as Kerber dropped her serve again in the ninth game.
  • Stephens to stay 'normal' with friend Keys ahead of Roland Garros clash

    Stephens to stay 'normal' with friend Keys ahead of Roland Garros clash

    The victor will reach another first - the finals at Roland Garros. "I'm very happy to win in straight sets". Sloane Stephens and Madison Keys ensured there will be an American in this year's French Open final.

    Trump on Talks with Trudeau: Relationship ‘Better Than It’s Ever Been’

    And I appreciate, you know, Justin has agreed to cut all tariffs and all trade barriers between Canada and the United States. President Donald Trump arrives for the G7 Summit , Friday, June 8, 2018 , in Canadian Forces Base Bagotville, Canada.
    President Trump commutes sentence of Alice Johnson after Kim Kardashian meeting

    President Trump commutes sentence of Alice Johnson after Kim Kardashian meeting

    Image: Johnson had spent more than 20 years in prison. "But it doesn't mean that we're going to stop here". CNN have also released footage of Alice being reunited with her family, following her release from prison .
  • DRC warlord Bemba 18-year jail sentence overturned

    DRC warlord Bemba 18-year jail sentence overturned

    He said Bemba would probably go to Belgium to meet with his family there before returning to Congo after he is released. However, the Appeals Chamber of the ICC ruled that he could not be held responsible for crimes committed by his troops.
    USA  special forces soldier killed, 4 wounded in Somalia attack

    USA special forces soldier killed, 4 wounded in Somalia attack

    The U.S. provided advice, assistance and aerial surveillance during the mission, the statement said. A Defense Department official told CBS News the attack was by the al Shabaab terror group.
    Only a few of Guatemala volcano’s dead identified

    Only a few of Guatemala volcano’s dead identified

    It said the lahars could sweep down the mountain laden with concrete, rocks up to a meter (yard) in diameter and tree trunks. A short video posted by the agency showed a steady flow of traffic away from the volcano to the sound of a blaring alarm.
  • Outbreaks in 36 States Linked to Backyard Poultry

    Outbreaks in 36 States Linked to Backyard Poultry

    Pre-cut melons have been removed from the shelves in both store chains, while whole melons do not appear to be affected. In rare cases, Salmonella infection can cause death unless the person is treated promptly with antibiotics.
    Woman dragged into water by gator in Davie

    Woman dragged into water by gator in Davie

    According to the woman's friends, her husband had urged her not to walk her dogs near the lake because he had seen gators before. Matsuki's husband, who is out of town, has been told his wife went missing after walking the dogs, the paper reported.
    Ex-Senate aide charged with lying about reporter contacts

    Ex-Senate aide charged with lying about reporter contacts

    The newspaper also said that Watkins said that Wolfe was not a source of classified information for her during their relationship. Prosecutors say Wolfe lied to the Federal Bureau of Investigation in December 2017 about contacts he had with three reporters.


Populaire

Donald Trump: Melania had ‘big operation,’ can’t fly for a month
The First Lady shook hands and greeted employees as she arrived at the event in Washington with husband Donald Trump . Trump has a medical team that is comfortable with her care, which is all that matters", Grisham said.

Le choc Del Potro - Nadal à Roland-Garros en direct
Il y aura forcément beaucoup de pression, ça sera une finale de Grand Chelem, j'ai déjà laissé beaucoup d'énergie derrière moi. L'Autrichien, numéro 7 mondial, a éliminé en trois sets et 2h17 de jeu Marco Cecchinato (7-5, 7-6 [10], 6-1).

Roland-Garros : la finale opposera Rafael Nadal à Dominic Thiem dimanche
J'ai progressé au fil de la quinzaine. "Ce sera dur mais je serai prêt", a prévenu le no 1 mondial. Ce vendredi, ça a déménagé sur le Central lors des deux demi-finales masculines.

Donald Trump pourrait gracier Mohamed Ali à titre posthume — États-Unis
Et le président Jimmy Carter avait offert une amnistie générale à tous ceux qui avaient refusé de servir au Vietnam. La semaine dernière, il en a ainsi fait bénéficier Dinesh D'Souza, un conservateur polémiste très anti-démocrate.

Amazon achète 20 matchs par saison — Premier League
Pour avoir accès à Amazon Prime il faut tout de même débourser 79 livres (90,1 euros) par an ou 7,99 livres (9,1 euros) par mois. La LFP et la Ligue 1 espéraient que ces opérateurs se porteraient candidats pour quelques-uns des lots mis en vente récemment.

Il déverse les déchets de ses ex-locataires devant leur maison!
Ils ont apparement laissé beaucoup de choses dans son appartement lorsqu'il l'a récupéré, "après 14 mois d'impayés". Les gendarmes sont venus et m'ont demandé de reprendre les détritus et de les jeter dans la déchetterie".

Asia Argento réagit à la mort de son ex-compagnon — Anthony Bourdain
Il avait soutenu la comédienne dans sa croisade contre le producteur déchu Harvey Weinstein , qu'elle accuse de l'avoir violée. Son esprit brillant et sans peur a touché et inspiré tant de personnes et sa générosité ne connaissait pas de limites.

Anthony Bourdain's death impacts local community
That figure still ranks only 38th among states , but the state's 40 percent increase since 1999 was the eighth-steepest rise. It is now the 10-leading cause of death in the US , and is one of only three leading causes of death that are on the rise .

Un acteur de "Sons of Anarchy" retrouvé mort
Mes pensées vont vers sa compagne, ses enfants, sa famille et ces amis. "Alan va beaucoup me manquer [.] Qu'il repose en paix". Cependant, le site TMZ rapporte qu'Alan O'Neill souffrait de problèmes cardiaques et précise que " c'était un gros fumeur ".

Porsche's first all-electric vehicle will be called the 'Taycan'
Despite the impressive performance, the Taycan will have a range in excess of 500 km (310 miles) in the New European Driving Cycle.