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"Ever since their discovery more than 165 years ago, massive fossilized structures left by an organism known as Prototaxites have proven impossible to categorize."
"Some 400 million years ago, the swamps of the late Silurian period would have sprouted a mix of horsetails, ferns, and other prototype plants that look positively alien today."
"Among them stretched 8-meter (26-foot) tall towers that defy easy identification. Wide and branchless, researchers have variously suggested these organisms were a form of algae or ancient conifer, based on what little evidence remains."