Quantcast
Discontinuous Rilles
94 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. LROC WAC 100 m/pixel monochrome mosaic. Blue box and white arrow indicate the locations of full NAC frame and today's Featured Image [NASA/GSFC/Arizona State University].


comments powered by Disqus