Discontinuous Rilles
95 of 550

Discontinuous Rilles

December 7, 2012
Sinuous rilles (like Hadley Rille, near the Apollo 15 landing site) are narrow, long depressions that meander across the lunar surface like a terrestrial river. Lunar geologists think that sinuous rilles formed either as erupting lavas carved their way through the surface, or by roof-collapse of lava tubes. A portion of the rille (named Rima Marius) in today's Featured Image is discontinuous, with a partially-closed depression that possibly marks the source region for this rille. Perhaps the "blockage" in the channel is a intact lava tube roof. While there are no signs of any natural bridge structures or other openings in this region, it is possible that a small section of the lava tube might have simply had its entrance and exit blocked by collapse debris. This image shows the Northwestern edge of disconnected depression (14.53°N, 311.43°E) from Rima Marius. Image number M135507533R, incidence angle 58°, image width is 550 meters [NASA/GSFC/Arizona State University].

comments powered by Disqus