craters with the interior, or fractured floor, are
among the most interesting of the Moon.
All right, you might even say that the large craters
Copernicus and Tycho, which do not have a fractured
interior are very interesting.
True, these two craters are very interesting, but do
they have as many different things as fractured
Let us consider some examples of fractured craters
such as Alphonsus, Posidonius, Gassendi and Petavius.
First, they are relatively large craters, with a
raised interior and concentric related fractures.
Second, these and other fractured interior craters
often have several types of channels, concentric
craters and dark halo craters.
Some cracked interior craters are old enough not to
have lightning (except the Taruntius),
because they already existed when the basalt seas were
being produced, an event that ended approximately 3 to
2.5 billion years ago.
Approximately all fractured interior craters are
located on the shores of the sea and the current model
is that magma
was born in the fractures of the basins and deposited
under the craters, raising its interiors and
generating eruptions of lava in its interiors.
In 1976, Pete Schultz was the first scientist to turn
his attention to the fractured interior craters
and to highlight them as a modified class of impact
craters, he even identified 206 of these craters but
never published a list of them.