Mass Extinction Event 259-263 Mya via volcanic activity.

In summary, a recent study published in Earth and Planetary Science Letters suggests that oxygen-deprived oceans were responsible for two mass extinctions during the Middle Permian Period, around 259 million and 262 million years ago. This research was conducted by a team of scientists, including Thomas Algeo of the University of Cincinnati, who noted the similarities between the current global warming crisis and the environmental changes that occurred during the Permian Period. The study's lead researcher, Huyue Song, also emphasized the relevance of these findings to current global issues such as ocean hypoxia, seawater acidification, and biodiversity decline.
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From physics org.

" researchers says evidence suggests this mass extinction was not a single event but two, separated by nearly 3 million years.

By studying uranium isotope profiles of marine samples collected in the South China Sea, scientists identified two "pulses" in which the oceans became deprived of oxygen.

https://www.sciencedirect.com/science/article/abs/pii/S0012821X23001413?via%3Dihub
In a study published in the journal Earth and Planetary Science Letters, researchers say their analysis provides evidence that the oxygen-deprived oceans precipitated two mass extinctions around 259 million and 262 million years ago during the Middle Permian Period.

"We are studying the biocrisis in the Permian Period, but similar warming is happening today because of human events," said Thomas Algeo, a study co-author and University of Cincinnati professor of geosciences. "Humans are mimicking the effects of volcanic eruptions as a consequence of the release of carbon into the atmosphere."

The study was led by researcher Huyue Song at the China University of Geosciences, a former postdoctoral researcher at UC.

"Today, we are facing several global change issues, including global warming, ocean hypoxia, seawater acidification and biodiversity decline, which are similar to the environmental changes during the Middle Permian biological crisis interval," Song said."
 
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@Bystander Should I have put a question mark in the title? Or something more substantial?
 

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