Carrillo: Support Using the number of existing primate species, along with measures of the genetic diversity among these primates and among the extinct primate species, our statistical model strongly supports the conclusion that Conclusion the first primate developed around 81.5 million years ago.
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Carrillo argues his statistical model shows that the first primates developed 81.5 million years ago.
Olson believes that Carillo’s estimate is purely speculative because the oldest primate fossils found date back to 55 million years ago.
Disagreement: Carillo and Olsen disagree over whether Carillo’s model is accurate.
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