Microbial Origin of Early Animal Trace Fossils? Mariotti, Giulio ; Pruss, Sara B. ; Ai, Xuyuan ; Perron, J. Taylor ; Bosak, Tanja Abstract Publication: Journal of Sedimentary Research Pub Date: April 2016 DOI: 10.2110/jsr.2016.19 Bibcode: 2016JSedR..86..287M