What can date objects up to 1 million years old?

Date objects up to 1 million years old can be determined using several methods, including radiometric dating techniques such as potassium-argon (K-Ar) dating and uranium-series dating. These methods rely on the decay of radioactive isotopes, which allows scientists to estimate the age of geological samples and fossils. Additionally, stratigraphy and paleomagnetic dating can provide context for dating sedimentary layers and ancient materials. However, the accuracy of these methods diminishes as the age of the sample increases.