Smithsonian Institution
National Museum of Natural History: Paleobiology: Absolute Dating
An explanation of radiometric or absolute dating of geological formations based on using the half-life of radioactive elements to figure out how old given rock layers are. A link on the left provides information about relative dating as...
Smithsonian Institution
National Museum of Natural History: David H. Koch Hall of Fossils: Deep Time
The Smithsonian Institution provides a virtual tour of the new "Deep Time" exhibit at the National Museum of Natural History.