In addition, fossil may also be signs (tracks) which is caused by living organisms, such as traces of living organisms and relentlessly crawling sediments the footprint and become a stone in a later time period, or may be a clog channels cavity (burrows) in sediments. Or in the rock caused by living organisms and minerals to crystallize on these channels. Animal manure or food in the stomach (coprolites) is a fossil that is useful to indicate the animal's eating habits. (Gastroliths) to help in the digestion of
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