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Rocks also have markers that help geologists determine their age. The exact process is complex, but all you need to know is that some atoms can change into other types of atoms (for example, Carbon can change into Nitrogen) by radioactive decay.Some radioactive materials decay more quickly than others (some take less than a second while others take billions of years! If we know how fast the element decays, we can determine its age almost like reading it off the sidewalk.As time passes, the "parent" radioactive elements change at a regular rate into non-radioactive "daughter" elements.Thus, the older a rock is, the larger the number of daughter elements and the smaller the number of parent elements are found in the rock.Four separate sets of glacial/periglacial morphosystems are present at different positions in the Western Tatras starting from valley outlets to the highest cirques, which represent successive phases of deglaciation.R-value means and 95% confidence intervals for selected Last Glacial Maximum (LGM), and Late Glacial (LG-1, LG-2 and LG-3) stages (respectively, 40.1 ± 1.1, 46 ± 0.5, 53.5 ± 1.0 and 60.5 ± 0.3) are significantly statistically different and values for each age category are comparable for the two analyzed valleys.

As shown in the diagram above, uranium is trapped in a newly formed rock.

Paleontologists still commonly use biostratigraphy to date fossils, often in combination with paleomagnetism and tephrochronology.

A submethod within biostratigraphy is faunal association: Sometimes researchers can determine a rough age for a fossil based on established ages of other fauna from the same layer — especially microfauna, which evolve faster, creating shorter spans in the fossil record for each species.

Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.

Layers of rock build one atop another — find a fossil or artifact in one layer, and you can reasonably assume it’s older than anything above it.