Did volcanoes on Mars erupt during the last days of the dinosaurs?
While Earth was still in its dinosaur era and entering mammalian history, Mars still had volcanic activity in the Tharsis region. This window of time overlaps with the last chapter of the dinosaurs and the early mammal boom on Earth.
A new study focused on a volcanic system south of Pavonis Mons, one of Mars’ giant shield volcanoes, and the timeline feels surprisingly recent. The oldest mapped eruptions in this system are about 64 million years old. Younger flows in the same neighborhood land about 50 million years. That’s recent by Martian standards, and close to the parts of Earth history people actually remember from school.
The other part that makes it fun is that this wasn’t a one-and-done outbreak. The researchers claim that the underground magma system continued to evolve over time. As Bartosz Pieterek says in a release: “Our results show that even during Mars’ most recent volcanic period, subsurface magma systems remained active and complex.” He added: “The volcano didn’t just erupt once; it evolved over time as underground conditions changed.”
Were Martian volcanoes still active when the dinosaurs were alive?
They took all this off without touching a single stone. The team used orbital spectroscopy data from CRISM on NASA’s Mars Reconnaissance Orbiter to read mineral signatures across different lava units. The older, fissure-fed flows show olivine signals, which point to hotter, deep source magma. Later, cone-related flows skew toward high-calcium pyroxenes, which fits a history where magma sat around, cooled, and chemically changed before making its next appearance.
The lava forms back it up. Older currents spread further and look smoother. Younger flows appear shorter and thicker, consistent with a change toward more evolved, sticky magma. In the paper, the authors describe a long-lived plumbing system lasting at least 9 million years, with eruptive activity shifting from fissure-fed flows to more localized, cone-building eruptions.
Mars is not “alive” in any practical sense. But it also remained geologically active later than many would guess. About 50 million years ago, it still had an interior hot enough to feed magma and sustain a long-lived plumbing system that evolved over time. It’s a different Mars than the frozen postcard version.
