Posidonius Rille

This image shows a sinuous rille located in the crater Posidonius. The source of this rille is a shallow pit on the northern crater wall (arrow). The rille then meanders along the edge of the crater floor for over 60 miles (100 km). Finally, it reaches a hole in the crater rim and vanishes into Mare Serenitatis. Note that the rille is also only the last stage of mare volcanism within this crater. It lies on top of an older, smooth mare unit which buries part of the crater floor and much of the western crater wall. ( The black bar in the lower right is about 6 miles (~10 km) long.) (Lunar Orbiter image IV-86-H3)

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