Fig. 10

Paleontologists rely on radiometric dating to determine the ages of fossils, such as this 310-million-year-old trilobite, Ameura major, from near Kansas City, Kansas. Photo courtesy Hazen Collection, Smithsonian Institution
Paleontologists rely on radiometric dating to determine the ages of fossils, such as this 310-million-year-old trilobite, Ameura major, from near Kansas City, Kansas. Photo courtesy Hazen Collection, Smithsonian Institution