[scottmagdalein]

Scientists, if carbon dating is limited to ~50,000 years or so, how do archeologists date things into the millions of years with accuracy?

[phansch]

Carbon dating is just a subset of radiometric dating. You can leverage the decay rates of (almost) any element to estimate the age of an object.

(http://en.wikipedia.org/wiki/Radiometric_dating#Fundamentals...)

[madaxe]

Also stratification and artefact context.