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Conservation Biology and Biodiversity
The Biodiversity Crisis
Biology Textbooks Boundless Biology Conservation Biology and Biodiversity The Biodiversity Crisis
Biology Textbooks Boundless Biology Conservation Biology and Biodiversity
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Biology
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Biodiversity Change through Geological Time

K-Pg mass extinction

K-Pg mass extinction

In 1980, Luis and Walter Alvarez, Frank Asaro, and Helen Michels discovered, across the world, a spike in the concentration of iridium within the sedimentary layer at the K–Pg boundary. These researchers hypothesized that this iridium spike was caused by an asteroid impact that resulted in the K–Pg mass extinction. In the photo, the iridium layer is the light band.

Source

    Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:

    "OpenStax College, The Biodiversity Crisis. October 17, 2013."
    http://cnx.org/content/m44892/latest/Figure_47_01_05.png OpenStax CNX CC BY 3.0.

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