The Tharsis Region of Mars is Peppered With These Strange Pit Craters. Now They've Been Found Elsewhere Images from HiRISE , article by Nancy_A
Called Atypical Pit Craters they generally have sharp and distinct rims, vertical or overhanging walls that extend down to their floors. They are usually cylindrical or bell shaped, and their surface diameters that can be a third larger than the usual pit craters. They can range from 50–350?meters in diameter.
The Tharsis region is the large volcanic plateau near the equator in the western hemisphere of Mars, which is home to the largest volcanoes in the Solar System, and scientists think the abundance of APC in that region stem from the underground tubes that may criss-cross between the giant volcanoes of Mars.But now MRO has found several APCs in another volcanic region that is older than Tharsis.
Scientists from MRO are excited to find these older APCs, as they feel they “should reveal erosional characteristics and possibly whether they are ancient or formed more recently. HiRISE has targeted many APC in Tharsis, butThe area around Elysium Mons has many craters on its surface, and while some have probably formed by meteor impact, there are many that show no ejecta pattern.
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