http://www.iflscience.com/space/volcanoes-erupted-moon-within-last-100-million-years The discovery of these rock deposits suggests that volcanoes were erupting on the moon within the last 100 million years -- during the Cretaceous when dinosaurs roamed the Earth -- making the moon much, much warmer than we thought. via Evidence Of Recent Volcanic Activity On The Moon Found | IFLScience.