The fossil tree on the Museum's east lawn is thought to have been in its current position since the 1970s, but it's been part of the collection since 1873. A large petrified tree that lived around 330 ...

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils ... can contain radioactive isotopes. The abundances of parent and daughter isotopes ...

Volcanic deposits are rich in radioactive isotopes, which provide chemical signatures essential for determining the age of fossils. A process called radioisotopic dating leverages the presence of ...