This find could date to a time early in the game.
No, he didn't, although that's certainly the impression your links to creationist sites would misleadingly like to give...
If the creationists have what they claim is a good scientific case, why do they have to lie about it so much?
A more accurate rendering of your falsehood would be: "Leakey found fossils of *early* humans (which were NOT "modern") at a level lower (older) than that of *later* australopithecines".
The earliest australopithecines are still far older than the earliest humans, though, contrary to the false implication the creationist sites are trying mightily to impart.
And I really wish you'd stop parroting creationist twaddle like this without having the ability to validate it yourself first. We've all got better things to do than waste more time correcting the misinformation you're spreading.
LOL! No he didn't. He found a bunch of stones in a (very rough and incomplete) circle! Here they are:
It's widely doubted that this arrangement of stones is even artifactual. But even if it was, why couldn't Australopithecines put some stones in a (very rough) circle?
TalkOrigins briefly addresses the stone circle here.