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Parts of three frames from the Apollo 17 panoramic camera were mosaicked
to form this high- resolution view. The crater Euler in southwestern Mare
Imbrium is an exceptionally fine example of a young mediumsized crater.
Twenty-seven km in diameter, Euler has most of the features that typify
young craters in this size range. Its sharp rim shows little evidence of
rounding. A solid blanket of ejecta is visible for approximately one- half
crater diameter outside the rim, and the radial pattern of secondary craters,
crater clusters, ridges, and grooves is visible outward to a full crater
diameter. Terraces formed by slumping of the steep crater walls, probably
contemporaneously with the formation of the crater, are clearly evident.
The steepness of the walls and the fact that the crater floor is below
the level of the surrounding mare surface indicate that relatively little
erosion and infilling have occurred. Other features typical of medium-sized
craters are the central peak and the level floor surrounding the central
peak. The pattern of ejecta around Euler is notably asymmetric because
the area was later flooded by mare lavas that inundated parts of the ejecta
blanket and other ejecta features. -M.C.M.
Report Source: NASA SP-362, Page 139, Figure 137
This web page was created by Francis Ridge
for The Lunascan Project
Section Directory 20