Tharsis Tholus (Mars)

This feature is named after an earlier feature.

Tharsis Tholus is an intermediate-sized shield volcano located in the eastern Tharsis region of the planet Mars. In planetary geology, tholus (pl. Tholi) is the term for a small domical mountain, usually a volcano. (wikipedia entry)

A tholus is a small domical mountain or hill. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.