It has come to our attention that in this Letter, there were some errors in the categorization of some of the modern datasets (R. Telford et al., personal communication). These errors affect 19 datasets and are highlighted in the Supplementary Information to this Corrigendum. Eight datasets were labelled as unknown and left out of the analyses, but should have been included. Two of these were mainland datasets, and six were island. One dataset labelled as island should have been mainland.
