Fragmented is the skeletons of individual shells, bones or pieces of wood broken into smaller pieces. Fragmentation is usually caused by predators and scavengers such as a coyote that break bones. Another processes of fragmentation in bones is wind and water. When bones are transported by wind or water they end up banging into rocks causing bones to break or even reduced to fine grains.
Michael J. Benton, and David A.T. Harper. Paleobiology and the Fossil Record. 2009