12 ms·

And how did they determine the age of the rock?

• jcmoscon 7y ago
  Scientists look at the bone and can tell the bones age. ((Just kidding))
• ralphhughes 7y ago
  There are many methods of determining rock age. A common one is finding signature fossils that are known to only exist between certain ages. Putting the rock in a machine to record its magnetic field and correlating this with pole reversals on earth. Using isotope ratios (not just radiocarbon dating), chemical composition, identifying how the sediment was laid down by rivers or the sea etc.
• 8bitsrule 7y ago
  This may be as close to ELI5 as it can be. https://simple.wikipedia.org/wiki/Radiometric_dating https://simple.wikipedia.org/wiki/Radiometric_dating