Fossils have been found in rocks of all ages, stretching back billions of years. However, most of the species found in the fossil record have died out or become extinct. Fossils don’t just show ...

Ammonite fossils, an example is shown here, are sea creatures that became extinct about 65 million years ago. Fossil remains have been found in rocks of ... in the fossil record because many ...

in the fossil record, but a 430-million-year-old mollusk ... He nicknamed that specimen after the emotional alt-rock genre. On Wednesday, Dr. Sutton and his colleagues published a paper in the ...