[c3534l]

I wonder if there are continents we'll never know about because they get completely subducted and aren't part of any existing continent today.

[mr_toad]

The map goes back less than a billion years. We don’t know much about the shape of the Earths continents for the first few billion years.

[rand0mx1]

Movement of plate tectonics started probably 750 million years ago. https://www.youtube.com/watch?v=DI6SemRT2iY

[sanxiyn]

Maybe the situation has changed recently, but as I understand there is no scholarly consensus on when plate tectonics started and it is the topic of active debate. For example Onset of Plate Tectonics (2011) https://www.science.org/doi/10.1126/science.1208766 says:

> The further back we look into the geological past, the more obscured the view, masked by an increasingly fragmentary geological record. This has resulted in a controversy on whether plate tectonics operated the same way, or even at all, during early Earth history.