Sources: PNAS , 
quote: Specifically, they sifted through sediments looking for leaf waxes, hardy biochemicals that tend to resist breakdown and survive, even over millions of years. By performing gas chromatography and mass spectrometry analyses on the various waxes, the researchers were able to pinpoint both the foliage and composition to within a couple centuries.
quote: Oh, that's right, this leaf wax was actually under the ground for "2 million years". So what they mean is these leaves were buried very quickly by some extinction event, you know, one of those events where billions of dead things were buried by water, and covered by rocks all over the planet.
quote: Historical records from antiquity, as well as tribal legends from all over the planet do actually mention one such event like that, but of course I doubt they'd be interested in knowing this, especially as these leaves were almost certainly buried in that event
quote: Do you know what I think? I think if they bothered to carbon 14 date the stuff they'd get a result, and it wouldn't be 2 million years old.
quote: You know what else I think? I think if they look around in those sediments they might actually find some seeds with DNA in them.
quote: I like that big collapse thing. Once we stop expanding from the big bang there is no reason gravity won't start pulling us all back. It could be a big endless cycle.
quote: Disorder increases with time. So following each cycle, the universe must get more and more disordered. But if there has already been an infinite number of cycles, the universe we inhabit now should be in a state of maximum disorder. Such a universe would be uniformly lukewarm and featureless, and definitely lacking such complicated beings as stars, planets and physicists – nothing like the one we see around us. One way around that is to propose that the universe just gets bigger with every cycle. Then the amount of disorder per volume doesn’t increase, so needn’t reach the maximum. But Vilenkin found that this scenario falls prey to the same mathematical argument as eternal inflation: if your universe keeps getting bigger, it must have started somewhere.