For over a century, a set of cryptic markings preserved in ancient rock has resisted every explanation paleontologists could offer — a quiet riddle passed from one generation of researchers to the next. Now, a team of scientists believes new analytical methods have finally illuminated the source of these traces, bringing the field closer to understanding the conditions and forces that shaped them. The breakthrough speaks to something enduring in the scientific endeavor: that the oldest questions are not abandoned, only waiting for the right instruments and the right moment.