At the start of episode 12 of Steins;Gate, Okarin and Mayuri have time traveled 70 million years into the past. They are in an arid desert environment which appears to be the inside of an hourglass. Mayuri says that you could say that they are just one of many versions of themselves, but you could also say that they were the originals. Shortly before dissolving into sand, she says that their wills will carry on to the versions of themselves in Akihabara 70 million years in the future.
In the future, Okarin snaps out of a daze, like he does when he time leaps. Does that imply that Okarin remembers the incident? Was the incident symbolic? If this was one of Okarin's attempts to save Mayuri, why didn't it happen in the alpha/beta/gate timelines?