In what time period would you find the largest mass extinction, where 95% of marine life and 70% of life on land becomes extinct

In the Permian period 250 million years ago we found the largest mass extinction  where 95% of marine life and 70% of life on land becomes extinct.

Explanation:

In the geological time scale, the era of mesozoic was very important. It contained the period of Triassic Jurassic Cretaceous. There after neozoic era has come in which Permian and Carboniferous was important period. In Permian period many species becomes extinct.

Both marine and land species got extinct in this time period. Devastating natural disasters were responsible for this turmoil and caused loss of mass of species on the earth's surface. Severe volcanic eruption was one the factor behind this massive destruction.

answer; i believe that the correct answer is (a); a large rock being weathered by wind and rain;