AS17-3107(P)

Figure 137

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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.