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23-Jan-2015 21:51

Ice cores showed the age of a military plane buried in the artic as thousands of years old.

Similarly, dendrochronology measures the tree rings in trees and assumes they represent years.

Dendrochronology is a technique of dating past climatic changes through a study of tree ring growth.

Each year a tree adds a layer of wood to its trunk and branches thus creating the annual rings we see when viewing a cross section.

Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.

It only sequences the age of things or determines if something is older or younger than other things.

Some types of relative dating techniques include climate chronology, dendrochronology, ice core sampling, stratigraphy, and seriation.

With the sinking of the land surface, sediments were deposited on the ocean floor.

Such recurring events as mountain building and sea encroachment and believed to be recorded in rock layers that comprise units of geologic time.Therefore, the actual length of geologic time represented by any given layer is usually unknown or, at best, a matter of opinion.