User blog comment:Wijata Mateusz/Imagine a world without the Americas/@comment-257949-20120724091103/@comment-4612798-20120726120745

Something I found yesterday but lost again... there's some equation which basically deals with ocean volumes when you have a single supercontinent (which is kind of what we have here). Its all to do with ocean temperances and stuff like that. But anyway, the gist was that when the continents are bunched together the seas are warmed less so sea level is lower (i.e the water is denser). So several OTL underwater areas could well be dry land in this scenario.