East central Mare Tranquillitatis, south of Cauchy crater. As one of the oldest near side basins, everything within carries the signatures of subsequent catastrophes. Far beyond Serenitatis, the stresses here radiate from Mare Imbrium. That landmark basin-forming-impact appears to have sloshed melt into Tranquillitatis, like muddy water into a dryer mud puddle. This may be the oldest exposed and deepest mare material on the Moon. That weight may have created the 124 km Rupes Cauchy scarp, partly seen at upper right. Two twelve kilometer volcanic domes, Cauchy Tau (l, near 7.6°N, 36.8°E) and Omega (r) are visible in this field of view seen in LROC Wide Angle Camera monochrome observation M117342496ME during LRO orbit 2412. January 4, 2010 [NASA/GSFC/Arizona State University].