Mass extinction comes every 62 million years

[Broomstick]

We don't actually know that - the fossil record isn't that exact. There could have been several species doing extraordinarially well while 90% were suffering great losses. Think of the way scavengers (rats, cockroaches, etc.) can have a population boom after a disaster that leaves multitudes of dead bodies around for snacking.

Beyond that - humanity could experience a population collapse at any time from a variety of causes. In which case, a million years from now, the fossil record isn't going to be exact enough to show the 10,000 year difference in time between the extinction of the mammoths and our crash.

[Sriad]

uh guys, we've already had our extinction, just 10,000 years ago. you know all that megafauna walking around? well it ain't here no more.

we're cool for another 60-70 million years.

besides, it seems like a rough figure anyways. 65 mya. end of the triassic (i think it was around 200 mya). 255 mya (permian extinction). that's not too consistent.

still, it is almost timed. a Dynasty of animals (mammal-like reptiles, dinos, etc.) sets it self up, and then get smacked down. eery.

as a side note, is it considered an extinction if 1 species is thriving while the others all collapse?

In reverse order:
An extinction is when all members of one species die. A mass extinction is when there is a significant drop in global biodiversity in a geologically short time; ie many species going extinct in time<a million years.

Although there were huge mass extinctions 225 and 65 MYA, there were several extinction events before the end of the Cretaceous which didn't themselves cause all the dinosaurs to die. The causes of the larger one, IIRC, was the breaking up of Pangea (the formation of which had a very prominent role in causing the Permian extinction; reduced coast lines caused more competition for shallow water habitats, having one huge land mass led to tremendous weather changes, whech meant different erosion levels, changing ocean chemistry... and when Pangea broke up, all that was reversed)

We had the start of our extinction; 10,000 years isn't a very long time on this scale. The megafauna were the first to go because they were a: in direct compitition with humanity for resources, and b: themselves convenient large bundles of resources. Mostly B which is why there aren't as many whales around as a lot of people would like.

...As a side note, check out Milankovitch Cycles, the rhythm of ice ages.