These remarkable arthropods first appeared in the fossil record during the Late Ordovician period, approximately 445 million years ago, predating dinosaurs by over 200 million years. By the time ...

CaveCreek4.jpg Penelope Donahue points out fossils in the limestone of the opening of Cave Creek Cave while on a June 8 hike in Santa Fe National Forest. The limestone, which is around 300 million ...

Around 450 million years ago, an arthropod was buried alive. Now, scientists have uncovered its fossil preserved in a ...

The authors assess shell thickness and ornamentation in brachiopods during the Permian–Triassic mass extinction (PTME) and in foraminifera during both the PTME and early Toarcian oceanic anoxic ...

Found in rock samples retrieved in Australia more than 60 years ago, the microfossils dating to the Lower Ordovician Period, approximately 480 million years ago, fill an approximately 25-million-year ...