Sepkoski Jr., J.J. 1992. Taxonomy and Stratigraphic Ranges of Animal Families in the Vendian and Cambrian: Data and Analytical Results for Section 11.4. In J.J. Sepkoski Jr. & J.F. Kasting. In J.W. Schopf & C. Klein (eds.), The Proterozoic Biosphere: a multidisciplinary study. Cambridge University Press, New York, NY: 1171-1184.