Researchers may have discovered a new way to classify dinosaurs, shaking up the 130-year-old method of dividing them up based on the shape of their hips. http://cnn.it/2n0y5QF | CNN

To try to solve the puzzle of Lark Quarry, experts have turned to a special subfield of paleontology -- paleoichnology, or the study of trace fossils -- to reconstruct exactly what happened on that spot, on that day, nearly 100,000 millennia ago. For more videos like this, check out our Youtube channel! youtube.com/eons | Eons • PBS