Geology Reference
In-Depth Information
Figure 4.28. The Apollo 16 landing site (X) was chosen to sample the
Cayley Plains, the extensive, smooth unit found in much of the
highlands (the area shown is about 95 km by 110 km; NASA AS
16
Figure 4.27. A Lunar Orbiter photograph of part of the interior of the
Orientale basin, showing the dark smoothmare lavas (top) of the basin
center,
fissured and hummocky deposits of the Maunder Formation
(middle of the image), and the knobby Montes Rook Formation; the
area shown is about 280 km by 312 km (NASA LO IV H-195).
-
0439).
Figure 4.29. A diagram showing the relative proportions of material ejected from an impact crater (solid black) and locally derived material
(dashed lines) as a function of distance from the crater. The initial ejecta consists of the
finest material which travels the greatest distance and
impacts at the highest velocities, resulting in generation of locally derived secondary ejecta deposits; late-stage ejecta consists of large
fragments deposited closest to the crater and proportionately is more abundant than locally derived material (from Oberbeck,
1975
).
