Which extinction event is marked by massive volcanic activity around 199 million years ago?

The End Triassic extinction is characterized by significant volcanic activity, particularly from the enormous volcanic eruptions that created the Central Atlantic Magmatic Province (CAMP) around 199 million years ago. This volcanic activity released vast amounts of carbon dioxide and other greenhouse gases into the atmosphere, leading to climate changes and ocean acidification, which were detrimental to many species. It is one of the five major mass extinctions in Earth's history, resulting in the loss of approximately 50% of all species on the planet.

The other extinction events mentioned occurred at different times and were associated with different causes, such as changes in sea level or the impact of extraterrestrial objects, which are not related to the massive volcanic activity seen during the End Triassic extinction. This context helps clarify the specific conditions and triggers that led to this particular mass extinction event.