For dating what kinds of Geologic samples containing uranium is 238U most useful? Why?

After C14, Uranium238 is most widely used mineral in geological or archaeological dating.

Explanation:

U238 is generally used to date the rock materials, to know the age. As we know the half-life of U238, it is easy to identify the age of the materials containing uranium 238. It can be called as absolute dating method as it determines the exact age of the uranium contained material. It is a type of radiometric dating.