Crocodiles, horseshoe crabs and tuatara are animals that have persisted for millions of years, said to have gone unchanged since the days of the dinosaurs. But even the most ancient-looking organisms show us that evolution is always at work. | Eons • PBS

For decades, one of the most abundant kinds of fossils on Earth, numbering in the millions of specimens, was a mystery to paleontologists. But geologists discovered that these mysterious fossils could basically be used to tell time in the deep past. | Eons • PBS

21M views · 270K shares | Miners in Canada came across what is considered to be the best preserved fossil of its kind. Meet the nodosaur, a plant-eating armored dinosaur. | National Geographic | Facebook