Pictured are fossil snails known as turritellid gastropods. Preserved in silicicalastic sand from the Paris Basin in France, the snails are about 13 million years old and represent another class of marine organisms affected by the Earth's periodic mass extinction events, as described in research by University of Wisconsin-Madison assistant professor of geology and geophysics Shanan Peters. The fossil is part of the collection of the UW-Madison Geology Museum. Image credit: courtesy Shanan Peters

Pictured are fossil solitary horn corals, an extinct group of corals preserved in carbonate that lived in a shallow marine environment in what is now Wisconsin 450 million years ago. The corals from the collection of the University of Wisconsin-Madison Geology Museum are an example of organisms affected by the world's mass extinction events, as described in research by UW-Madison assistant professor of geology and geophysics Shanan Peters. Image credit: courtesy Shanan Peters

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