Sunday , November 17 2019
Home / argentina / Scientists say the discovery of fossilized field from the day of the killing the dinosaurs died

Scientists say the discovery of fossilized field from the day of the killing the dinosaurs died



[ad_1]

In the first place, it was a cruel shock. Then there was a moat 30 feet high water waves, throwing the fish in the shallows that are now North Dakota. Then there was a hail of molten rock, throwing the fish die, and soon-to-be-dying land animals. Then the fires started.

<P class = "cloth fabric-atom-text Mb (1.0em) Mb (0) – see Mt (0.8em) – see" type = "text" content = "This is how the death of the dinosaurs began almost 66 million years ago, according to a study to be published in Proceedings of the National Academy of Sciences& NBSP ;. Next week "data reactid =" 32 "> This is how the death of the dinosaurs began about 66 million years ago, according to a study to be published in the Proceedings of the National Academy of Sciences the next week.

For decades, scientists have suggested that the Duma took place when a giant asteroid or comet hit Earth in the immediate vicinity of the coast of the Yucatan Peninsula in Mexico. A new study puts the script as a cosmic impact destroyed the species thousands of miles, covering what is known as the Cretaceous period.

Ancient rock layer, found on the site dubbed "Tanis" in the formation of North Dakota Hell Creek revealed fossils of fish, snails, like sea creatures called ammonites and sea reptiles known as mosasaurs, plus land animals, including mammals and triceratops, mixed fossil bits were burnt tree trunks, sludge and small glass beads known as tektites.

The research team behind the discovery by Robert DePalma, curator of paleontology at the Palm Beach Museum of Natural History in Florida and a doctoral student at the University of Kansas. DePalma examines the site of Tanis in 2013, and he says that sheds new light on the chain of events that created the famous geological and biological dividing line known as the Cretaceous-Paleogene boundary of, Cretaceous-Tertiary boundary or just K-Pg or KT boundary.

<P class = "fabric-atom-canvas text MB (1.0em) MB (0) – see Matt (0.8em) – see" type = "text" content = "" This is the first mass death of organisms large assembly who found bound with the boundary CT " DePalma said in a press release"In no other KT boundary section in the world can you find such a collection consisting of a large number of species of organisms, different ages and different stages of life, all of whom died at the same time, on the same day. "" These -reactid = «36"> "This is the first major gathering of the mass death of organisms who are found associated with the KT boundary," DePalma said in a news release. " No other KT boundary section in the world can you find such a collection consisting of a large number of species of organisms, different ages and different stages of life, all of whom died at the same time, on the same day. "

Researchers Ian Smith, Mark Richards and Walter Alvarez stand together at the site of Tanis. (Robert DePalma Photos from UC-Berkeley)

DePalma and his colleagues reconstructed the sequence of events on that fateful day, looking carefully at the site of the rock.

<P class = "web-atom web text Mb (1.0em) Mb (0) – see Mt (0.8em) – see" type = "text" content = "" This is the end of chalk as a museum in the layer thickness of half a meter, "said study co-author Mark RichardsRector and Professor of Earth and Space Sciences at the University of Washington. "Data reactid =" 58 ">" It's like a museum in the late Cretaceous period in the layer thickness meter and a half, "said study co-author Mark Richards, rector and professor of Earth and Space Sciences at the University of Washington.

<P class = "fabric-atom-canvas text MB (1.0em) MB (0) – see Matt (0.8em) – see" type = "text" content = "The detective work was based on an analysis by Richards and Walter Alvarez, a professor University of California at Berkeley, who He helped lay the original giant asteroid hypothesis almost 40 years agoThey measured the evidence for a tsunami like waves and hail of glass beads, and laid out a scenario that began with the installation of an asteroid with magnitude 10 or 11 earthquake. "These reactid =" 59 "> detective work was based on the analysis of Richards and Walter Alvarez, a professor at the University of California, Berkeley, who helped put the original giant asteroid hypothesis almost 40 years ago. They measured the evidence for a tsunami like waves and hurricane glass beads, and outlined a scenario that began with the installation of the asteroid 10 or 11 earthquake magnitude.

<P class = "cloth fabric-atom-text Mb (1.0em) Mb (0) – see Mt (0.8em) – see" type = "text" content = "This earthquake hit could create a series of standing waves, also known as a seiche, in the body of water known as Western Interior Seaway that scientists say are stretched to the middle of North America during the Cretaceous period. "These reactid =" 60 "> This is a seismic blow could create a series of standing waves, also known as seiche, in the body of water known as the Western Interior Seaway, which scientists say is extended to the middle of North America during the Cretaceous period.

Meanwhile, the impact would be thrown asteroid massive column of molten rock, which turned into globular tektites, drizzled from space in a wide dies Earth's surface. Richards and Alvarez came to the conclusion that standing waves have washed the fish in place before the deadly hail of Tanis was to end.

Mm wide glass beads, known as tektites have been found on the site of Tanis. (Robert DePalma photo)

"Seismic waves start to occur within nine to 10 minutes of exposure, to enable them to receive the water dangle before all balls fallen from the sky," Richards explained. "These balls come cratered surface that make funnel – you can see the deformed layers that was soft mud. – and then the rubble covered balls "

A layer of sediment, which is coated with iridium was rich fragments, confirming the connection with a giant asteroid Alvarez hypothesis.

"When we proposed a hypothesis to explain the impact of a large extinction, it was based only on the search for anomalous concentrations of iridium – an imprint finger asteroid or comet," said Alvarez. "Since then, the evidence is gradually built up. But it never occurred to me that we would find the dying, as it ".

The researchers say that the massacre must be started quickly – too quickly to be explained tsunami emanating from the place of the Chicxulub asteroid impact. "The tsunami would have taken at least 17 hours or more to get to the place of the crater, but seismic waves – and the next surge – would reach him for several tens of minutes," said DePalma.

DePalma Richards credited to clarify that part of the script.

"When Mark got up on the board, he found a great artifact – the input seismic waves from the point of impact would only come about the same time as the atmospheric journey time ejecta," DePalma said. "It was our big break."

Fossil fish stacked on top of each other, offering TAHT they were cast ashore and died stranded together in the shallows after the tsunami, the wave went. (Robert DePalma Photos from UC-Berkeley)

Dutch geologist Ian Smith ran tests on tektites with Tanis site – and confirmed that they date back to the K-T extinction.

Some of tektites have been embedded in amber, and some of them were built in the gills of fish fossil. "That in itself is an amazing fact," Smith said. "This means that the first direct victims of the impact of these clusters of fish."

Researchers believe that the final act of mass extinction K-T started when hot hail tektites caused massive forest fires, killing many creatures that survived the initial shock.

The exact location of the site Tanis kept secret to protect it from counterfeiting. "We went 40 years before something like this was, that may well be unique," Smith said. "So we must be very careful with this place, as we dig it and learn from it."

<P class = "fabric-atom-canvas text MB (1.0em) MB (0) – see Matt (0.8em) – see" type = "text" content = "Update 8:40 pm PT on March 29: The study was drawn skepticism even before its official publication, as a paleontologist Kenneth Lakovara points on Twitter. As a result, we have revised the title of this report to be more circumspect. Here are a few tweets to get you started on a carving Twitter: "data reactid =" 116 ">Update 8:40 pm PT on March 29: The study was drawn skepticism even before its official publication, as a paleontologist Kenneth Lakovara points on Twitter. As a result, we have revised the title of this report to be more circumspect. Here are a few tweets to get you started on the Twitter thread:

<P class = "fabric-atom-canvas text MB (1.0em) MB (0) – see Matt (0.8em) – see" type = "text" content = "In addition to DePalma, Richards, Alvarez and Smit, the study authors Proceedings of the National Academy of Sciences"Prelude to Extinction: seismically induced coastal Surge deposit CNG borders North Dakota," include David Burnham, Klaudia Kuiper, Philip Manning, Anton Oleinik, Peter Larson, Florentin Maurrasse, Johan Vellekoop and Lauren Gurche. This report is based on Information from the University of California at Berkeleythen University of Washington and University of Kansas, To an in-depth report on the check DePalma This article from The New Yorker."Data-reactid =" 120 ">The annex to DePalma, Richards, Alvarez and Smit, authors of the study in the Proceedings of the National Academy of Sciences, "Prelude to Extinction: seismic induced Coast Surge deposit CNG borders North Dakota," include David Burnham, Claudia Kuiper, Philip Manning, Anton Olejnik, Peter Larson, Florentino Maurrasse, Johan Vellekoop and Lauren Gurche. This report is based on information from the University of California at Berkeley, the University of Washington and the University of Kansas. For an in-depth report on the work DePalma check out this article from The New Yorker.

More from GeekWire:

[ad_2]
Source link