This date marks the end of the Cenozoic Era and the Pleistocene Period on the geologic time scale.
Ice cores, pollen, wood, hair, bone, shell, bird egg shell, and coral are some of the things datable by this technology which depends on measuring the atomic decay rate of carbon isotopes.
Potassium-argon dating is a method for estimating the age of volcanic rocks by measuring the ratio of potassium-40 to argon-40 present.
The method is based on the fact that the potassium-40 isotope of potassium decays over time to form argon-40.
The half-live of potassium-40 is approximately 1.26 billion years (that is, 1.26x10 years).
Obviously, this formula depends on the laws of physics remaining constant over time.