While many paleobiologists now accept Knauth’s premise that simple, unicellular life forms existed on land during the Precambrian, others recoil from his more radical proposal that complex, multicellular life — and even animal life — also thrived on land 600 ma BP. “In my old age, I am so disappointed that people close their minds and jump on whatever splashy, simplistic bandwagon is in vogue. But if you start with the rocks and work upward to an interpretation, it often reveals a reality that is not the one in vogue.”

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