Correction to: Scientific Reports https://doi.org/10.1038/s41598-018-19601-w, published online 18 January 2018
Harry Toland was omitted from the author list in the original version of this Article. This has been corrected in the PDF and HTML versions of the Article, and in the accompanying Supplementary Information file.
The Acknowledgements section now reads:
“This project was funded by grants from the UK Natural Environmental Research Council (NERC; grant nos NER/B/S/2002/00540 and NE/DO12996/1) and NERC Radiocarbon Facility support (NRCF010001 allocation number 1201.1006). We thank members of the Department of Earth Sciences at Addis Ababa University for scientific and logistical support, especially the late Mohammed Umer; Addis Zeleke of Addis Geosystems plc; and the Amhara Region Agricultural Research Institute. Data are archived at the UK National Geoscience Data Centre, http://www.bgs.ac.uk/services/ngdc/home.html.”
The Author Contributions section now reads:
“H.F.L., C.R.B., S.J.D. and D.H. planned the project and undertook fieldwork in Ethiopia. M.H.M. undertook fieldwork and carried out XRF scans and laboratory analyses. H.M.R. determined luminescence dates and constructed the age model; C.B. carried out radiocarbon analyses. H.T. assisted with fieldwork and in the laboratory. All authors discussed the results and interpretation. H.F.L. wrote the manuscript with input from C.R.B., S.J.D., D.H. and H.M.R.”