Approximately how old is the fossil evidence discovered for a monk seal (a Phocidae member) in the Southern Hemisphere?
Answer
At least 6.5 million years ago.
Fossilized remains identified as a monk seal in the Southern Hemisphere show that ancestors of this group were present there at least 6.5 million years ago.

#Videos
The Evolution of Seals, Sea Lions, and Walruses - YouTube
The Evolution of Seals - YouTube
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