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Theophilus is older than King, Copernicus, and Aristarchus, and many of its original features are more subdued than are those of the younger craters. Here on the north rim, the entire width of the Theophilus ejecta blanket can be seen, and irregular-appearing secondary impact craters are visible beyond the blanket at the top of the picture. In the middle of the scene, smooth material occurs in pools on top of the ejecta blanket. Smaller pools of similar material are present on the terraces in the wall of Theophilus. D. J. Milton (1968) originally discovered this pooled material in the mid-1960's from telescopic studies and suggested that it might be volcanic. This Apollo 16 view shows that the pools are very similar to, but more degraded than those on the rims of King (Figures 149, and 155, 156, & 158 ) and other fresh craters such as Tycho and Copernicus. This similarity suggests that the pool material may be rock melted by the Theophilus impact. -K.A.H.
Report Source: NASA SP-362, Page 164, Figure 167
This web page was created by Francis Ridge
for The Lunascan Project
Section Directory 46