This image from NASA Mars Reconnaissance Orbiter shows cones with summit pits that are very similar to cinder cones on Earth. They are also very well-preserved, peppered by only small impact craters, so they must be geologically young.
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Details
Title: Recent Volcanism in Valles Marineris
Creator: NASA/JPL-Caltech/Univ. of Arizona
Date Created: 2014-01-15
Rights: JPL
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