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The
image is of a 1.5 km2 area located within the 1100 km diameter Isidis
Planitia impact basin. Many such cones have been identified within
the basin, often arranged in clusters or aligned in chains. Although
no associated lava flows have been identified, a volcanic origin
is favoured. It is thought that the cones were constructed from
the eruption of ash and cinder at points along fractures and fissures
in the Martian crust.
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