The authors wish to make the following corrections to this paper [1]: Please replace Funding section with the funding below: Funding: This research was funded under the NERC DOMAINE programme (NE/K010689/1); NERC LOCAR programme (NER/F3/G13/17/41; NER/T/S/2001/00942), jointly funded by the Environment Agency); a NERC Isotope Geoscience Facility grant (NER/IP/779/0902); and a NERC studentship for Hannah Prior (GT4/94/402), jointly funded by English Nature. We also acknowledge the immense field support from Nigel Crook, supported under a NERC LOCAR grant NER/T/S/2001/00948, and Heather Musgrave, funded through a further NERC studentship NER/S/A/2003/11344. The authors would like to apologize for any inconvenience caused to the readers by the change. The change does not affect the scientific results. The manuscript will be updated and the original will remain online on the article webpage, with a reference to this correction. © 2020 by the author.