In geology, rock or superficial deposits , fossils and lithologies can be used to correlate one stratigraphic column with another.
The half life of U is million years. Though relative dating can only determine the sequential order in which a series of events occurred, not when they occurred, it remains a useful technique. What scientists use two techniques to all kinds of the oldest rocks and tree rings. Most useful for determining the age by comparing its placement with science of fossils. Amino acid racemisation Archaeomagnetic dating Dendrochronology Ice core Incremental dating Lichenometry Paleomagnetism Radiometric dating Radiocarbon Uranium—lead Potassium—argon Tephrochronology Luminescence dating Thermoluminescence dating.