Precise dating of the 686 ± 2 CE Newberry Pumice eruption and insights into 7th century volcanism from cryptotephra and sulfur isotopes in Greenland ice - Helen M. Innes; William Hutchison; Michael Sigl; Joseph R. McConnell; Nathan J. Chellman; Britta J.L. Jensen; Jakub T. Sliwinski; Andrea Burke (Quaternary Science Reviews, 2026)