Hadley Rille (from Orbit)
Hadley Rille (from Surface)
Schroter's Valley 1
This photo shows Schroter's Valley (arrow) and the Aristarchus Plateau. It lies between Mare Imbrium and Oceanus Procellarum. This valley is the largest (widest) sinuous rille on the Moon. It also has a smaller rille inside it (see next photo). Both rilles come from the same vent, but they probably reflect two separate eruptions. Both rilles fade away into the plains of Oceanus Procellarum. (Apollo 15 image M-2611, from Wilhelms (1987) The Geologic History of the Moon, USGS Prof. Paper 1348.)
This is a detailed photo showing part of Schroter's Valley (see last image). It clearly shows a complex, highly contorted rille inside the Valley. Like many rivers on the Earth, this rille has many tight loops along its course. These loops are meanders, and they suggest a long-lived flow on a fairly flat surface. They also require active erosion of the valley floor. This channel may have partially melted its way into older lava flows. (Part of Apollo 15 image P-341.