“This study demonstrates that eggshell biocalcite from non-avian dinosaurs, birds, and other egg-laying vertebrates has the potential to serve as a reliable geochronometer in Mesozoic and Cenozoic ...

Near the top of the world’s highest peak, climbers sometimes spot seashells and delicate crinoid stems locked inside pale limestone, a jarring sight in the thin, frozen air. Those fossils formed on an ...

Skeleton season may be just around the corner, but the skeleton age dawned with the early Cambrian Period, about 538 million to 506 million years ago. In this time span, most major animal groups ...