thumb|right|Oblique view facing south from [[Apollo 16]]

Bullialdus is a lunar impact crater located in the western part of the Mare Nubium. T. W. Webb calls it a "grand crater ... with a quadruple central hill". To the north by north-west is the broken-rimmed and lava-flooded crater Lubiniezky. South-west of Bullialdus lies the smaller crater König.

thumb|right|Another Oblique view from Apollo 16

The relatively isolated location of this crater serves to highlight its well-formed shape. Bullialdus has a high outer rim that is circular but observers have noted a slightly polygonal appearance. The inner walls are terraced and contain many signs of landslips. The outer ramparts are covered in a wide ejecta blanket that highlights a radial pattern of low ridges and valleys.

thumb|right|Bullialdus crater as viewed from earth, below left of center

On the lunar geologic timescale, Bullialdus is a crater of Eratosthenian age.

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Sources

  • Central Peak of Bullialdus Crater, Lunar Reconnaissance Orbiter Camera, Posted by Samuel Lawrence on May 11, 2010.
  • Bullialdus Central Peak Oblique, Lunar Reconnaissance Orbiter Camera, Posted by Sarah Braden on January 23, 2013.