石化森林中的派对(Party in the petrified forest)

最结实的伐木工人和最好的油锯无法切割石化森林国家公园中发现的巨大“木材”。那么，为什么这些巨石原木被分割成如此对称的树桩呢？
原文：
The burliest lumberjack with the best-oiled chainsaw couldn't slice the massive 'timbers' found in Petrified Forest National Park. So why are these giant stone logs segmented in such symmetrical stumps?
《© Ian Shive/Tandem Stills + Motion》