autoclastic

from The Century Dictionary.

• In geology, noting a fragmental rock produced by dynamic crushing or granulation, without loss of cohesion: contrasted with sediments the particles of which come from a distance.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Geol.) Broken in place; -- said of rocks having a broken or brecciated structure due to crushing, in contrast to those of brecciated materials brought from a distance.