Lunar Ring Dikes from Orbiter I

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Science  06 Jan 1967:
Vol. 155, Issue 3758, pp. 77-79
DOI: 10.1126/science.155.3758.77


Orbiter photographs of the wall of a large circular formation on the moon show that the wall is a convex body resembling a flow of viscous lava. The slopes are less than the angle of repose of dry rock; hence an explanation in terms of mass wastage is hard to support. The viscosity is approximately 1013 centimeter-gram- second units, indicating an acid lava.