Lunar dome

They are typically formed by highly viscous, possibly silica-rich lava, erupting from localized vents followed by relatively slow cooling.

Lunar domes are wide, rounded, circular features with a gentle slope rising in elevation a few hundred meters to the midpoint.

It is thought that these domes are formed from a smaller magma chamber that is closer to the surface than is the case for a mare.

The cluster of lunar domes at the Marius Hills was considered as a possible landing site of Apollo 15.

There are concentrations of lunar domes near the craters Hortensius, and T. Mayer, across the top of Mons Rümker, and in Mare Fecunditatis.