For archaeologists, fossils sandwiched between volcanic ash layers are invaluable as geological time stamps.
Articles on Radiometric dating
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Global cooling associated with the impact of supernova remnants may have affected plants and animals, including species related to humans.
Using a method applied directly to ancient hominin teeth, researchers have calculated the age of several important fossils.
Measuring the concentration of radioactive elements in a single, sand-size crystal reveals the growth of the Himalayan mountain range over time.
A biologist explains how researchers nail down the age of ancient fossils thanks to a physical process called radioactive decay.



