Pangaea is only the name of the most recent supercontinent. The past ones all have their own names. https://en.wikipedia.org/wiki/Supercontinent

Of the 10 on that list, multicellular life appears around #8 (Pannotia).

Tolkien himself was unsure if we were in the 6th or 7th age

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I doubt if there would have been much gain; and I hope the, evidently long but undefined, gap* in time between the Fall of Barad-dûr and our Days is sufficient for 'literary credibility', even for readers acquainted with what is known or surmised of 'pre-history'

I imagine the gap to be about 6000 years : that is we are now at the end of the Fifth Age, if the Ages were of about the same length as S.A. and T.A. But they have, I think, quickened; and I imagine we are actually at the end of the Sixth Age, or in the Seventh.

Source - The Letters of J.R.R. Tolkien, Letter 211

We have basically had to conclude that Tolkien’s star Borgil[0] is Aldebaran, because Betelgeuse wasn’t a red star in the classical era[1], or before.

[0]: https://tolkiengateway.net/wiki/Borgil [1]: https://news.ycombinator.com/item?id=32478492