For example, the Oligocene-Miocene boundary (around 23 million years ago) was marked by a period of intense volcanic activity in the Andes. This period coincided with a significant turnover in whale species, with the extinction of many archaic whale groups and the rise of modern whale families.
The volcanic activity could have caused changes in ocean circulation, sea levels, and food availability, which may have stressed whale populations and contributed to their extinction. Additionally, the volcanic ash and aerosols released during eruptions could have blocked sunlight, leading to cooling and reduced primary productivity in the oceans, which could have further impacted whale populations.
Further research is needed to fully understand the relationship between Andean volcanic activity and whale evolution and extinction. However, it is clear that volcanic eruptions can have significant impacts on the environment and can play a role in shaping the course of evolution.
