Question

Early geologists were only able to place rocks in their proper order of formation based on their layering. This is called

Answer 1

I think it's called Relative dating

Answer 2

Early geologists were only able to place rocks in their proper order of formation based on their layering. This is called relative dating. Relative dating is putting a series of events or objects in chronological order, this does not include actual dates. It is used to arrange geological events and the rocks left behind.