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This law allows a general age sequence to be established for layers or strata at a site or location.date of organic material - but an approximate age, usually within a range of a few years either way.The more fossilized remains available for study, the more information can be obtained and a more complete understanding achieved.The incomplete fossil record is due in part to lack of discovery, as only some areas are the focus of excavation and investigation.

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Non-radiometric methods include dendrochronology, or tree-ring dating, amino acid dating, fission track, paleomagnetic dating, electron spin resonance, and luminescence.

These specific required conditions explain why fossils are so rare. : The Making of the Biological Past Response: Since fossilization requires very unique circumstances, fossils are very rare.