We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleWhere's the glass? Biomarkers, molecular clocks, and microRNAs suggest a 200‐Myr missing Precambrian fossil record of siliceous sponge spiculesAuthorsSPERLING, E. A.; ROBINSON, J. M.; PISANI, D.; PETERSON, K. J.PublicationGeobiology, 2010, Vol 8, Issue 1, p24ISSN1472-4677Publication typearticleDOI10.1111/j.1472-4669.2009.00225.x