A bizarre fossil called Prototaxites, which was the largest life-form on land 400 million years ago, may have been a completely unknown form of multicellular life, according to a new study.

Add Yahoo as a preferred source to see more of our stories on Google. A life reconstruction of Prototaxites taiti growing in the 407-million-year-old Rhynie chert ecosystem. (CREDIT: M. Humpage, ...

(CNN) — A cache of human-like fossils from China has perplexed scientists for decades, defying explanation or categorization. The skull fragments, teeth, jaws and other remains unearthed at different ...