Geological Chronicle
Rupes Cauchy is a 120-kilometer escarpment in the northeastern portion of Mare Tranquillitatis. Facing southwest, the scarp rises about 200 to 300 meters above the surface. Its eastern end emerges from the highlands on the eastern margin of Mare Tranquillitatis.
The 3.6 km diameter crater Cauchy C intersects the scarp due south of Cauchy crater itself, while Cauchy E and F lie to the north side and Cauchy B lies on the south side. At the western end are two similar-sized elongate depressions unlikely to be impact craters. Between Cauchy B and these depressions, the feature forms an en echelon pattern similar to veins within rock on Earth on a grand scale, with the similar-sized craters Sinas J and H lying to the west.
Rupes Cauchy casts a thin shadow about five days after the new moon, when the sunrise terminator is nearby and sunlight arrives at a low angle. The feature name was shown as Fossa Casals on a 1974 map based on Apollo 15 photographs, but the name was not approved by the IAU. The term Rupes was used in favor of Fossa for lunar scarps such as Rupes Recta or Rupes Altai.