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John Baez Mastodon
๐ ๐๐๐ ๐๐๐๐๐๐ We know there was an asteroid impact around when the dinosaurs went extinct 65 million years ago, because we see a rare metal called iridium in the strata from this time - and droplets formed by molten quartz. But we also see lots of fern spores! This is called a 'fern spike', and it's not the only one. Ferns spread rapidly using spores, and they're tougher than they look. When everything dies, these ancient, humble plants are the first to recolonize the land. They did it after the Permian-Triassic, Triassic-Jurassic and Cretaceous-Paleogene extinction events. They may dโฆ
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