Lunar breccias are rocks produced by the smashing, melting, and mixing of the lunar surface materials by large and small meteoric impacts. Evidence of this process can be seen in the countless craters of various sizes which cover the Moon.

CRISIUM BASIN
The Crisium basin, about 700 kilometers (430 miles) in diameter is one of many large circular lunar depressions. These basins or craters formed by the collisions of very large meteoroids with the Moon. After the impacts, basalts from the interior of the Moon welled up and partially filled the basins. Material thrown out by the impacts that produced the basins is spread widely over the Moon.

CRATER LAMBERT
This crater in Mare Imbrium, 32 kilometers (20 miles) in diameter, is surrounded by a blanket of material blasted out by the impact that produced the crater. Near the crater's rim the ejected material is thick and hilly. Farther away, the material is thinner and has a radial pattern.

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