reply to post by diamondsmith
i'm not too sure, however, it tells a tale that just perplexes the mind.
It is speculated that the Earth's atmospheric environment was a more oxygen rich environment, which enabled animals and insects to grow to such
amazing sizes. However, it would be a Carbon Dioxide rich environment that would have had to prevail for trees of this astonishing magnitude to exist.
I'd speculate that those trees as revealed by the geology they're found in in South Dakota grew to heights in the thousands of feet, and most likely
existed before any land based, oxygen breathing animal life became prevalent.
It's said that some catastrophic event killed and buried these giants, which probably prevailed in enriching Earth's environment with more oxygen
than was available back then... perhaps a comet hit, which inserted more H2O onto the planet surface, and injected more oxygen into the atmosphere via
the evaporative properties from the explosion.

