BioTech Encyclopedia

Mass extinctions and recovery: uses in research

Also: K-Pg extinction, Cretaceous-Paleogene, Alvarez hypothesis, iridium anomaly, dinosaur extinction, Corral Bluffs

About 66 million years ago an asteroid impact ended the age of the dinosaurs. Fossils show how life recovered afterwards.

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  1. 1980 The asteroid hypothesis
  2. 2019 Recovery after the extinction

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lab biology 1980

The asteroid hypothesis

Alvarez and colleagues found iridium spikes of about 20 to 160 times background at the Cretaceous-Tertiary boundary in Italy, Denmark and New Zealand and proposed that a large asteroid impact caused the extinctions.

As reported in: Alvarez, Alvarez, Asaro et al. (1980). Extraterrestrial Cause for the Cretaceous-Tertiary Extinction. Science. doi:10.1126/science.208.4448.1095

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lab biology 2019

Recovery after the extinction

Lyson and colleagues described fossils from Colorado showing mammal diversity doubled within about 100,000 years after the K-Pg extinction, with larger mammals appearing alongside new plants like the bean family over the next 700,000 years.

As reported in: Lyson, Miller, Bercovici et al. (2019). Exceptional continental record of biotic recovery after the Cretaceous–Paleogene mass extinction. Science. doi:10.1126/science.aay2268

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