Multiple choice Which geological era is characterized by major extinction events? Paleozoic Mesozoic Cenozoic Tertiary Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Mesozoic era is famous for the extinction of non-avian dinosaurs at the K-Pg boundary, though the Paleozoic also had major events. Given the options, Mesozoic is the most commonly cited in this context for major mass extinctions.