Marius Hills
Shown here are the Marius Hills in Oceanus Procellarum. These hills are
the largest group of volcanic cones and domes on the Moon. Note the fairly
uniform size and appearance of these features. Also note the sinuous
rilles which have formed within the reg ion. (Lunar Orbiter image
IV-157-H2, from Wilhelms (1987) The Geologic History of the Moon, USGS
Prof. Paper 1348.)