A unique volcanic field in Tharsis, Mars: Pyroclastic cones as evidence for explosive eruptions

► We present morphologic and morphometric analyses of a volcanic field in Tharsis, Mars. ► The field displays evidence for pyroclastic cones and associated lava flows. ► The field is the only one of its kind on Mars. ► The eruptive style is explosive as compared to younger effusive lava plains. ► This difference could plausibly be explained by a more volatile-rich upper crust in the past or, perhaps more likely, by volatile-richer magma during eruption.