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dec 15, 200000000 BC - Conodant teeth

Description:

one of the first structures built from hydroxyapatite, a calcium-rich mineral that remains a key component of our own bones and teeth today

Source: https://userpages.umbc.edu/~squire/extinctions.html

Added to timeline:

Fossil/Species Timeline

ByJohn Le
26 Oct 2018

Date:

dec 15, 200000000 BC
Now
~ 5883516 years ago

Images:

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