THEMIS: Swiss-cheese weathering in old volcanic region

Circular erosion in lava flows (THEMIS_IOTD_20181122)THEMIS Image of the Day, November 22, 2018. Amphitrites Patera is an old volcanic complex located south of Hellas Planitia.

The surface in this VIS image has a unusual “Swiss-cheese” texture, one seen more commonly on the nearby south polar ice. The surface appears to be eroding in a fashion that creates small circular features which grow and coalesce into larger circles.

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