Photogeological, geophysical, and geochemical data on the east side of the moon

Correlations between Apollo orbital data and geologic data for eight map provinces are reported for a region centered on the east limb of the moon (50 deg N to 50 deg S and 50 deg E to 140 deg E). The appearance of the provinces is described, and the basins in or near the region are assigned relative ages. The western (nearside) part of the region averages about 3 km lower in elevation than the eastern (farside) part, according to laser altimeter measurements which are used to make geologic cross sections. Gravity data correlate with most geologic provinces and the surface profiles made by the laser altimeter and lunar sounder. The distribution of concentration ratios of Al/Si and Mg/Si as well as the distribution of relatively low natural radioactivity are considered.