The Geology of Other Planets
"All Moon rocks [.....] are roughly divisible into
three types: basalts, anorthosites, and breccias.
Basalts are dark lava rocks that fill mare basins; they
generally resemble, but are much older than, lavas that comprise the oceanic
crust of Earth.
Anorthosites are light rocks that form the ancient highlands;
they generally resemble, but are much older than, the most ancient rocks
Breccias are composite rocks formed from all other rock
types through crushing, mixing, and sintering during meteorite impacts.
The Moon has no sandstones, shales, or limestones such as testify to the
importance of water-borne processes on Earth. "
The preceding quote is from the web site http://exploration.jsc.nasa.gov/curator/lunar/lunar10.htm
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