George L. Guice, Michael R. Ackerson, Robert M. Holder, Freya R. George, Joseph F. Browning-Hanson, Jerry L. Burgess, Dionysis I. Foustoukos, Naomi A. Becker, Wendy R. Nelson, and Daniel R. Viete

ORIGINAL ARTICLE: 2021, v. 17, no. 2, p. 561–581, https://doi.org/10.1130/GES02289.1. First published 5 February 2021.

ERRATUM PUBLICATION: 2021, v. 17, no. 2, p. 684, https://doi.org/10.1130/GES02289e.1. First published 12 March 2021.

In the Table 3 note and captions of Figures 8 and 9, the equation Fe2+# = molar Fe2+/[Mg+Fe2++Fe3+] is incorrect. It should instead be Fe2+# = molar Fe2+/[Mg+Fe2+].