Referring to the Permian period in geology, which is a major division of the Paleozoic Era.

पर्मियन अवधि

English Usage: During the Permo-Triassic extinction event, a significant number of species went extinct.

Hindi Usage: पर्मियन-त्रैसिक विलुप्ति घटना के दौरान, कई प्रजातियाँ लुप्त हो गईं।