Definitions

1. noun

the ancient or extinct fauna of a particular region or geological period, especially of an area that is now under water.

“Fossil discoveries have revealed the paleofauna of the region, which has been submerged for millions of years.”

2. plural noun

the collective totality of the ancient or extinct fauna of a particular region or geological period.

“The team of paleontologists has been studying the paleofauna of the region to understand the evolution of life on Earth.”