Resting traces are impressions left where an organism as settled in for some period of time. Some lagoonal, estuarine, lacustrine or tidal flat deposits may be dominated by fecal pellets. The Bahamas Banks is an example of such an area. However it is important to be able to recognize them so that you will not confuse them with primary structures. They may be several meters in diameter and generally accumulate along a particular stratigraphic horizon.
Some concretions have fossils at the center.
Crack develop and forms a box-like network.