Figure 221

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This detailed view of a mare surface near the eastern edge of Mare Serenitatis, just west of the Apollo 17 landing site, shows the numerous small grooves. They are unusual features that have not been observed in such large numbers elsewhere. They are here developed in a thick accumulation of regolith overlying an ancient mare basalt. At first glance, resembling chains of secondary impact craters, they are more logically interpreted as structural features. A likely explanation is that they are the result of drainage of unconsolidated regolith into openings caused by fissuring in the consolidated bedrock. At some localities, drainage did not occur at a uniform rate along the fissure but was concentrated at certain points, resulting in a series of unequally spaced, pitlike depressions (arrows) along the groove.   -B.K.L.

Report Source: NASA SP-362, Page 209, Figure 221

This web page was created by Francis Ridge for The Lunascan Project
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