Figure 37

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An oblique view of the southeastern part of the Imbrium basin, one of the largest multiringed, circular basins on the Moon. Most scientists agree that it was formed by the impact of an asteroid, comet, or other planetary body striking the lunar surface at hypersonic velocity. The Imbrium event excavated a depression nearly 1300 km in diameter in the terrae, uplifted and intensely deformed the adjacent terrae, and blanketed much of the lunar surface with debris ejected from the depression. The depressed area was subsequently flooded by lava flows to form the dark relatively smooth surface recognized as Mare Imbrium. The Montes Apenninus form the southeastern rim of the basin. They and other rugged areas of light material visible here are ancient terrae uplifted by the impact event and covered to varying thicknesses by ejecta debris. Material from the Apennine Mountains was collected by the Apollo 15 astronauts who landed near the foot of the mountains not far to the left and below (that is, to the northeast of) the area shown here. The arcuate trends parallel to the margin of the Imbrium basin are mostly faults associated with the formation of the basin. The numbers are explained in the caption for figure 38. -M.W.

 See also, same area from AS17-1828

Report Source: NASA SP-362, Page 50, Figure 37

This web page was created by Francis Ridge for The Lunascan Project
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