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Radiometric dating utilizes the decay rates of certain radioactive atoms to date rocks or artifacts.Uniformitarian geologists consider this form of dating strong evidence that the Earth is billions of years old.

An isolated population of the aristata is also located near Flagstaff, Arizona.

A third member of the bristlecone pine family, the Sierra Foxtail pine (Pinus balfouriana) is located in the southern Sierra range and in isolated groves in northern California. Bailey determined that there were significant genetic and physical differences between the bristlecones in the Great Basin and those in the Rocky Mountains.

While the oldest trees are found in the mountains of Eastern California, Great Basin Bristlecone Pine (Pinus longaeva) are scattered throughout the high mountain regions of Nevada and to a lesser extent, Utah.

A cousin, the Rocky Mountain Bristlecone Pine (Pinus aristata), is located throughout the eastern Rocky Mountain region in Colorado and New Mexico.

The use of carbon-14, also known as radiocarbon, to date organic materials has been an important method in both archaeology and geology.

The technique was pioneered over fifty years ago by the physical chemist Willard Libby, who won the 1960 Nobel Prize for his work on C.The carbon absorbed is both C-12 and C-14 and it is absorbed at the same ratio as it exists in the atmosphere.Once a living thing dies, it stops absorbing both C-12 and C-14.Originally classified as a foxtail pine because of the needle arrangement (like a cat or fox's tail), these trees were redesignated in the late 1800's and named bristlecone due to the long prickly "bristle" on the immature cone. His research efforts resulted in another redesignation into two separate species named bristlecone: the Rocky Mountain Bristlecone Pine and the Great Basin Bristlecone Pine.In the White Mountains, the ancient bristlecone pines seem to show a preference for growing on the white, rocky soil that gives the name to this mountain range.Carbon-14 is a radioactive isotope formed in the upper atmosphere.

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