Dorsa Smirnov and Posidonius                             Earth-based telescopic image                              Lunar Orbiter image .

Larger version of above by Legault  pos_m_r.jpg

Full sized  version of Lunar Orbiter image 4-86H1.jpg

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Brief

Parallel to the eastern edge of Mare Serenitatis there is a prominent system of wrinkle ridges. Formerly known as as the Serpentine Ridge, its northern part is now called Dorsa Smirnov. The wrinkle ridges are rounded, are of modest height (tens to hundreds of meters) and are observable only when they are close to the terminator. At their highest point, formerly named Posidonius gamma, lies a small crater about two km across. The walled plain Posidonius (large crater) is 95 km in diameter, 2300 m deep and  has a complicated system of rilles on its floor.

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Other Lunar Orbiter images

http://cass.jsc.nasa.gov/research/lunar_orbiter/img/4-86H1.jpg  http://cass.jsc.nasa.gov/research/lunar_orbiter/img/4-79H1.jpg

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For the latest information and images regarding this section, including Apollo Hasselblad (H), Metric (M), and Panoramic (P) images, go to: Sections 14 & 24   Clickable Sections Map

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