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An earth system approach to understanding the end-Ordovician (Hirnantian) mass extinction (2014)
Book Chapter
Armstrong, H., & Harper, D. (2014). An earth system approach to understanding the end-Ordovician (Hirnantian) mass extinction. In G. Keller, & A. Kerr (Eds.), Volcanism, impacts, and mass extinctions : causes and effects (287-300). Geological Society of America. https://doi.org/10.1130/2014.2505%2814%29

The Hirnantian mass extinction is recognized as the first of the "big three" extinctions and, along with the end-Permian and end-Cretaceous events, is the result of an acceleration in biotic extinctions concomitant with a rise in originations. The Hi... Read More about An earth system approach to understanding the end-Ordovician (Hirnantian) mass extinction.

A suspension-feeding anomalocarid from the Early Cambrian (2014)
Journal Article
Vinther, J., Stein, M., Longrich, N., & Harper, D. (2014). A suspension-feeding anomalocarid from the Early Cambrian. Nature, 507(7493), 496-499. https://doi.org/10.1038/nature13010

Large, actively swimming suspension feeders evolved several times in Earth’s history, arising independently from groups as diverse as sharks, rays and stem teleost fishes1, and in mysticete whales2. However, animals occupying this niche have not been... Read More about A suspension-feeding anomalocarid from the Early Cambrian.