Mass Extinctions,Volcanism, and Impacts: New Developments: Geological Society of America Special Paper 544 (Adatte et al., 2020),the second of two special papers on mass extinctions, volcanism, and impacts, contains nine chapters. (Note: This review was written without the benefit of having read the first special paper.) The majority of this collection is focused on interpreting models regarding the acidification of water and the impact on organisms that depended on carbonates to grow.

The first chapter, Volcanism as a Prime Cause of Mass Extinctions: Retrospectives and Perspective, by Grzegorz Racki, provides the reader with a general...

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