Numeric age dates based on radioactivity are very important for studying Proterozoic geologic history because fossils are rare or absent.

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Proterozoic rocks are generally characterized by the absence or rarity of fossils, which makes it difficult to establish the age of the rocks based on biostratigraphy. Instead, radiometric dating based on the decay of isotopes in rocks provides numerical age dates that are crucial for understanding the timing and duration of Proterozoic geological events.

Numeric Age Dates Based on Radioactivity Are Very Important for Studying