Re: Can this be so?
Pangaea was just the latest in a series of supercontinents. It was made by assembling Gondwana (pedant note: you don't need the 'land' since Gondwana means 'land of the Gonds') which is a borderline supercontinent of its own as well as Laurentia, Baltica and Siberia.
Before that there was Pannotia around the 0.6Gy mark which is associated with the Pan African Orogeny that created the modern African continent, that followed the surprisingly long-lived Rodinia (1.25-0.75Gy) that contained pretty much everything apart from the Kalahari and the Congo craton.
Prior to that things get a bit hazier because the magnetic records of rocks have largely been overprinted by later orogenies. The Columbia (Nuna) supercontinent around 1.8-1.5Gy is highly likely to have existed - odd place - eastern India docked to where California would be and Australia neighbours with Canada.
Further back there is Kenorland which seems to be associated with diamonds and iron formations between 2.7Gy and 2.0Gy, and the hazy Ur that work in South Africa and Australia suggests might date as far back as 3.6Gy. But at that point the geology is getting seriously buggered and whilst it is possible to work out the sort of processes that were going on (a mix of modern subduction and weird buckling of continents), it's almost impossible to relate the continental fragments to one another.