Lunar ring dikes from orbiter I.
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 10(13) centimeter-gram- second units, indicating an acid lava.
O'keefe
J A
JA
Lowman
P D
PD
Cameron
W S
WS