Imbrium sculpture between Albategnius Crater (lower left) and Hipparchus Crater (top). Progression in degradation of furrows is shown by: 1, sharp rimmed; 2, moderately subdued; 3, highly subdued (north toward top).

The text of the Report describes the figure as follows:

Studies of Apollo 16 stereographic photographs in the vicinity of the large craters Albategnius and Hipparchus (fig. 29-37) show that some troughs have relatively sharp rims or edges, whereas others are moderately to highly subdued. In this respect, variations in morphology of the troughs are probably analogous to some of the criteria used for the age classification of impact craters. On this basis, the sharpest appearing troughs may be as young as late Imbrian in age. Some may have volcanotectonic origins and thus may be younger than similar appearing features formed by impact, if endogenetic processes produce forms with an inherently old appearance. However, most of the troughs seem to be older than plains material, and their buried outlines on the floor of Albategnius Crater are shown well on Apollo 16 metric camera frames 0448 and 0449 adjacent to figure 29-37. In the area of figure 29-37 (best seen at higher Sun angles as in Apollo 16 metric camera frames 2803 and 2804), grabenlike, rimless, linear furrows grade into arcuate rimmed depressions resembling highly coalescent crater chains. These latter characteristics are not definitive and may reflect either a volcano-tectonic or secondary-impact crater origin.

Photographic data:

Image Name: AS16-M-0168

Mission: Apollo 16

Revolution (Orbit): 17

Camera: Mapping/Metric

Exposure: 00:00:00.035

Camera Tilt: VERT

Scan Pixel Scale: 7.065

Start Time: (DOY:112) 1972-04-21T04:21:02

Spacecraft Altitude: 108.39 km

Center Coordinates (lat, lon): -9.14°,6.93°

Corner Coordinates: -6.22°,4.14°

-6.46°,9.78°

-12.05°,9.64°

-11.9°,3.85°

Sun Elevation: 7.0°

Features: HALLEY, HIND, RITCHEY

Film Type: 3400

Color: black&white