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Researchers, Based On Oxygen-18 And Oxygen-16 Isotopes Archived In ~3.2-Billion-Year-Old Piece Of Oceanic Crust Found In The Panorama District Of The Pilbara Craton, Western Australian, Are Stating That Earth May Have Been Covered In Water, Around 3 Billion Years Ago, Without Any Continents Separating The Oceans.

https://www.theguardian.com/science/2020/mar/02/earth-may-have-been-a-water-world-3bn-years-ago-scientists-find

Chemical signatures in ancient ocean crust point to a planet without continents