It has been brought to our attention that there were several features of our 2021 paper in Paleobiology (Swain et al. 2021) in which certain procedures were omitted, data and results required further discussion, or one or more of our analyses could have benefited from an alternative approach. We are taking this opportunity to address, correct, and update the record, detailed below in the following points.

The rarefaction curve in figure 1A, labeled as the Williamson Drive flora, erroneously included data from all four assemblages, which are now segregated, from oldest to youngest, into the Williamson Drive (WD), Mitchell...

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