Latest Permian–Triassic extinction event Stories
The greatest mass extinction in Earthâ€™s history also may have been one of the slowest, according to a study that casts further doubt on the extinction-by-meteor theory.
By the most conservative measure - based on the last century's recorded extinctions - the current rate of extinction is 100 times the background rate. But many scientists estimate that the true rate is more like 1,000 to 10,000 times the background rate.
The earth experienced its biggest mass extinction about 250 million years ago, an event that wiped out an estimated 95% of marine species and 70% of land species. New research shows that this mass extinction fundamentally changed the basic ecology of the world's oceans.
The world's largest mass extinction was probably caused by poisonous volcanic gas, according to research published today.
British researchers have hit on a clever way to search for ancient ozone holes and their relationship to mass extinctions: measure the remains of ultraviolet-B absorbing pigments ancient plants left in their fossilized spores and pollen.
A study of fossils from the Paleozoic Era, collected across the world, reveals that ancient brachiopods were little bothered by predators. However, the rare predation traces left on brachiopod shells by unknown assailants coupled with a subtle increase in their frequency through time may be the shadows on the wall that show killers were in the room and their numbers increased with time.
Scientists can recite a long list of the devastating environmental consequences of a large meteorite impact, but they cannot prove these effects have led to the simultaneous loss of life around the globe. How and why such a large variety of species died out at the same time are two of the greatest mysteries in paleontology.
An ancient version of global warming may have been to blame for the greatest mass extinction in Earth's history. In an event known as the "Great Dying," some 250 million years ago, 90 percent of all marine life and nearly three-quarters of land-based plants and animals went extinct.
Two hundred and fifty million years ago, ninety percent of marine species disappeared and life on land suffered greatly during the world's largest mass extinction. The cause of this great dying has baffled scientists for decades, and recent speculations invoke asteroid impacts as a kill mechanism.
- Sleep; the state or condition of being asleep.
- The state or condition of numbness of a part due to pressure on a nerve: as, the obdormition of a limb.