Aristarchus Plateau is the primary location for these transient events, says Crotts, followed by the craters of Plato, Grimaldi, Kepler, Copernicus and Tycho.
But in one, a formation known as Cobrahead, on the Aristarchus Plateau at the edge of the Ocean of Storms, Clementine's cameras saw a definite reddening of a sinuous feature called a rille.