Tuesday, July 5, 2022
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Tag: Extinction

Examples of radiolarians, a type of microplankton. These tiny lifeforms need normal salinity seawater with plenty of nutrients including silica to grow and maintain their glassy shells. Researchers at the University of Texas Institute for Geophysics found fossilized radiolarians in geologic samples dating back 56 million years, proving that life persisted in the Gulf of Mexico despite global warming that left many oceans barren. Credit: U.S. Geological Survey
Paleontology

Research shows how Gulf of Mexico escaped ancient mass extinction

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An ancient bout of global warming 56 million years ago that acidified oceans and wiped-out marine life had a milder effect in the Gulf...
Brachiopod fossils from the Ordovician Period outcrop on Anticosti Island, Quebec, Canada. (Credit: André Desrochers, University of Ottawa)
Paleontology

Uncovering the secrets behind Earth’s first major mass extinction

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We all know that the dinosaurs died in a mass extinction. But did you know that there were other mass extinctions? There are five...
Rafinesquina, seen in this close-up shot, was an ancient genus of brachiopod belonging to order Strophomenida. This order survived two mass extinction events, but the second represented a ‘death sentence’ from which they were unable to recover diversity, persisting for another hundred million years as a ‘dead clade walking’ before their eventual extinction. IMAGE: Provided by Benjamin Barnes
Fossils

New insights into mass extinctions

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Mass extinctions are known as times of global upheaval, causing rapid losses in biodiversity that wipe out entire animal groups. Some of the doomed...
These fossil ammonites have lost their outer coating of shell, revealing the iridescent nacre beneath. Now extinct, ammonites were a group of marine mollusks that first appeared about 409 million years ago, persisting until the extinction event that wiped out the dinosaurs about 66 million years ago. Credit: Florida Museum photo by Jeff Gage
Paleontology

Rise of marine predators reshaped ocean life as dramatically as mass...

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Evolutionary arms races between marine animals overhauled ocean ecosystems on scales similar to the mass extinctions triggered by global disasters, a new study shows. Scientists...
End Triassic vs Anthropocene
Paleontology

New placement for one of Earth’s largest mass extinction events

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Curtin University research has shed new light on when one of the largest mass extinction events on Earth occurred, which gives new meaning to...
The origin of endothermy in synapsids, including the ancestors of mammals. The diagram shows the evolution of main groups through the Triassic, and the scale from blue to red is a measure of the degree of warm-bloodedness reconstructed based on different indicators of bone structure and anatomy. Credit: Mike Benton, University of Bristol. Animal images are by Nobu Tamura, Wikimedia
Paleontology

World’s greatest mass extinction triggered switch to warm-bloodedness

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Mammals and birds today are warm-blooded, and this is often taken as the reason for their great success. University of Bristol palaeontologist Professor Mike Benton,...
Summary of major extinction events through time, highlighting the new, Carnian Pluvial Episode at 233 million years ago. Credit: D. Bonadonna/ MUSE, Trento
Paleontology

Discovery of a new mass extinction

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It's not often a new mass extinction is identified; after all, such events were so devastating they really stand out in the fossil record....
Roughly 66 million years ago an asteroid slammed into the Yucatan peninsula. New research shows darkness, not cold, likely drove a mass extinction after the impact. Credit: NASA
Fossils

Fossil Pollen Record Suggests Vulnerability to Mass Extinction Ahead

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Reduced resilience of plant biomes in North America could be setting the stage for the kind of mass extinctions not seen since the retreat...
A team of researchers led by professor Brian Fields hypothesizes that a supernova about 65 light-years away may have contributed to the ozone depletion and subsequent mass extinction of the late Devonian Period, 359 million years ago. Pictured is a simulation of a nearby supernova colliding with and compressing the solar wind. Earth’s orbit, the blue dashed circle, and the Sun, red dot, are shown for scale. Graphic courtesy Jesse Miller
Paleontology

Exploding stars may have caused mass extinction on Earth, study shows

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Imagine reading by the light of an exploded star, brighter than a full moon -- it might be fun to think about, but this...
URI graduate student Reilly Hayes (left) and undergraduate Amanda Bednarick examine an outcrop for fossils at Petrified Forest National Park as part of their research. Credit: Amanda Bednarick
Asteroid

Asteroid, climate change not responsible for mass extinction 215 million years...

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A team of University of Rhode Island scientists and statisticians conducted a sophisticated quantitative analysis of a mass extinction that occurred 215 million years...
Researchers dated ash deposits from this hill, called a koppie in South Africa. The lower part of koppie Loskop exposes strata from before the end-Permian extinction (Palingkloof Member of the Balfour Formation), while the upper part contains layers deposited after the extinction (Katberg Formation). Credit: John Geissman
Paleontology

In Earth’s largest extinction, land die-offs began long before ocean turnover

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The mass extinction at the end of the Permian Period 252 million years ago—one of the great turnovers of life on Earth—appears to have...
A reconstruction of Laurasichersis relicta which lived in the northen hemisphere 66 millons years ago. Credit: José Antonio Peñas (SINC)
Fossils

One single primitive turtle resisted mass extinction in the northern hemisphere

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Sixty-six million years ago, in the emerged lands of Laurasia—now the northern hemisphere—a primitive land tortoise, measuring about 60 cm, managed to survive the...
A new study led by Yale University confirms a long-held theory about the last great mass extinction event in history and how it affected Earth's oceans. The findings may also answer questions about how marine life eventually recovered. Credit: Michael Henehan & Pincelli Hull
Paleontology

Mystery solved: Ocean acidity in the last mass extinction

Geology Page -
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A new study led by Yale University confirms a long-held theory about the last great mass extinction event in history and how it affected...
This photograph shows rocks from the Belcher Islands in Hudson Bay, Canada, from which doctoral candidate Malcolm Hodgskiss collected barite samples dating 2.02 to 1.87 billion years old. Credit: Malcolm Hodgskiss
Dinosaur

Ancient die-off greater than the dinosaur extinction

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Clues from Canadian rocks formed billions of year ago reveal a previously unknown loss of life even greater than that of the mass extinction...
A volcano erupts
Volcanoes

New evidence suggests volcanoes caused biggest mass extinction ever

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Biggest Mass Extinction Researchers say mercury buried in ancient rock provides the strongest evidence yet that volcanoes caused the biggest mass extinction in the history...
foraminifera
Paleontology

Evolution imposes ‘speed limit’ on recovery after mass extinctions

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It takes at least 10 million years for life to fully recover after a mass extinction, a speed limit for the recovery of species...
Paleontology

In ancient oceans that resembled our own, oxygen loss triggered mass...

Geology Page -
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Roughly 430 million years ago, during the Earth's Silurian Period, global oceans were experiencing changes that would seem eerily familiar today. Melting polar ice...
Scientists are peeking into ancient oceans to unravel the complexities of mass extinctions, past and future.
Paleontology

Researchers uncover new clues to surviving extinction

Geology Page -
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Scientists are peeking into ancient oceans to unravel the complexities of mass extinctions, past and future. A new examination of Earth's largest extinction by...
This is a view of Coalcliff in New South Wales, Australia, where researchers discovered evidence that Earth's largest extinction may have extinguished plant life nearly 400,000 years before marine animal species disappeared. Credit: Christopher Fielding
Earth

Earth’s largest extinction event likely took plants first

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Little life could endure the Earth-spanning cataclysm known as the Great Dying, but plants may have suffered its wrath long before many animal counterparts,...
This illustration shows the percentage of marine animals that went extinct at the end of the Permian era by latitude, from the model (black line) and from the fossil record (blue dots). A greater percentage of marine animals survived in the tropics than at the poles. The color of the water shows the temperature change, with red being most severe warming and yellow less warming. At the top is the supercontinent Pangaea, with massive volcanic eruptions emitting carbon dioxide. The images below the line represent some of the 96 percent of marine species that died during the event. Includes fossil drawings by Ernst Haeckel/Wikimedia; Blue crab photo by Wendy Kaveney/Flickr; Atlantic cod photo by Hans-Petter Fjeld/Wikimedia; Chambered nautilus photo by ©2010 John White/CalPhotos. Credit: Justin Penn and Curtis Deutsch/University of Washington
Paleontology

Biggest mass extinction caused by global warming leaving ocean animals gasping...

Geology Page -
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This illustration shows the percentage of marine animals that went extinct at the end of the Permian era by latitude, from...
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