Maloof, A.C., S.M. Porter, J.L. Moore, F.Ö. Dudás, S.A. Bowring, J.A. Higgins, D.A. Fike, and M.P. Eddy. 2010. “The Earliest Cambrian Record of Animals and Ocean Geochemical Change”. Bulletin of the Geological Society of America 122: 1731-74. doi:10.1130/B30346.1.

Jones, D.S., R.W. Brothers, A.-S.C. Ahm, N. Slater, J.A. Higgins, and D.A. Fike. 2020. “Sea Level, Carbonate Mineralogy, and Early Diagenesis Controlled δ13C Records in Upper Ordovician Carbonates”. Geology 48. Geological Society of America: 194-99. doi:10.1130/G46861.1.