How do we know the age of rocks?

Have you ever wondered how geologists know the age of rocks? In this video, Larry answers that very question!
“Layers with Larry” is produced by the Draper Natural History Museum at the Buffalo Bill Center of the West. To visit the Center or learn more please see: centerofthewest.org/
For more information on collecting fossils, please see: www.blm.gov/sites/blm.gov/fil...